cleanup

# Conflicts:
#	common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/PCGUI.kt
#	common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/StorageWidget.kt

CHANGELOG.md

@@ -2,6 +2,7 @@
 ## [1.8.3 (MONTH xth, 2026)](#1-8-3)
 
 ### Additions
+- You can now drag to select multiple Pokémon inside the PC menu.
 
 ### Pokémon Added
 #### Generation 4

common/src/main/kotlin/com/cobblemon/mod/common/CobblemonNetwork.kt

@@ -566,6 +566,7 @@ object CobblemonNetwork {
         list.add(PacketRegisterInfo(SwapPartyPokemonPacket.ID, SwapPartyPokemonPacket::decode, SwapPartyPokemonHandler))
 
         list.add(PacketRegisterInfo(MovePCPokemonPacket.ID, MovePCPokemonPacket::decode, MovePCPokemonHandler))
+        list.add(PacketRegisterInfo(MovePCPokemonBatchPacket.ID, MovePCPokemonBatchPacket::decode, MovePCPokemonBatchHandler))
         list.add(PacketRegisterInfo(MovePartyPokemonPacket.ID, MovePartyPokemonPacket::decode, MovePartyPokemonHandler))
 
         list.add(PacketRegisterInfo(SwapPCPartyPokemonPacket.ID, SwapPCPartyPokemonPacket::decode, SwapPCPartyPokemonHandler))

common/src/main/kotlin/com/cobblemon/mod/common/api/storage/pc/PCStore.kt

@@ -29,6 +29,7 @@ import com.cobblemon.mod.common.net.messages.client.storage.pc.InitializePCPacke
 import com.cobblemon.mod.common.net.messages.client.storage.pc.MoveClientPCPokemonPacket
 import com.cobblemon.mod.common.net.messages.client.storage.pc.SetPCPokemonPacket
 import com.cobblemon.mod.common.net.messages.client.storage.pc.wallpaper.UnlockPCBoxWallpaperPacket
+import com.cobblemon.mod.common.net.messages.server.storage.pc.MovePCPokemonBatchPacket
 import com.cobblemon.mod.common.pokemon.Pokemon
 import com.cobblemon.mod.common.util.DataKeys
 import com.cobblemon.mod.common.util.asTranslated
@@ -270,6 +271,34 @@ open class PCStore(
         }
     }
 
+    fun moveBatch(moves: List<Triple<UUID, PCPosition, PCPosition>>): Boolean {
+        if (moves.isEmpty() || moves.size > MovePCPokemonBatchPacket.MAX_MOVES) return false
+        if (moves.map { it.second }.toSet().size != moves.size ||
+            moves.map { it.third }.toSet().size != moves.size ||
+            moves.map { it.first }.toSet().size != moves.size
+        ) return false
+        if (moves.any { (_, source, target) -> !isValidPosition(source) || !isValidPosition(target) }) return false
+
+        val sourcePositions = moves.mapTo(mutableSetOf()) { it.second }
+        val pokemonMoves = moves.map { (pokemonID, source, target) ->
+            val pokemon = get(source)?.takeIf { it.uuid == pokemonID } ?: return false
+            Triple(source, target, pokemon)
+        }
+        if (pokemonMoves.any { (_, target, _) -> get(target) != null && target !in sourcePositions }) return false
+
+        pokemonMoves.forEach { (source, _, _) -> setAtPosition(source, null) }
+        pokemonMoves.forEach { (_, target, pokemon) -> setAtPosition(target, pokemon) }
+
+        pokemonMoves.forEach { (_, _, pokemon) ->
+            sendPacketToObservers(RemoveClientPokemonPacket(this, pokemon.uuid))
+        }
+        pokemonMoves.forEach { (_, target, pokemon) ->
+            sendPacketToObservers(SetPCPokemonPacket(uuid, target) { pokemon })
+        }
+        pcChangeObservable.emit(Unit)
+        return true
+    }
+
     override fun loadPositionFromNBT(nbt: CompoundTag): StoreCoordinates<PCPosition> {
         return StoreCoordinates(this, PCPosition(nbt.getShort(DataKeys.STORE_BOX).toInt(), nbt.getByte(DataKeys.STORE_SLOT).toInt()))
     }

common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/BoxStorageSlot.kt

@@ -29,7 +29,8 @@ class BoxStorageSlot(
 
         val grabbedSlot = parent.grabbedSlot
         return if (grabbedSlot == null) {
-            true
+            val pokemon = getPokemon()
+            pokemon == null || !parent.isInMultiSelection(pokemon, position)
         } else {
             grabbedSlot.getPokemon() != getPokemon()
         }

common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/PCGUI.kt

@@ -50,6 +50,7 @@ import net.minecraft.network.chat.Component
 import net.minecraft.sounds.SoundEvent
 import kotlin.isInitialized
 import net.minecraft.resources.ResourceLocation
+import net.minecraft.util.FastColor
 
 class PCGUI(
     val pc: ClientPC,
@@ -129,6 +130,55 @@ class PCGUI(
     var selectPointerOffsetIncrement = false
     var displayOptions = false
 
+    private var dragStartX: Int? = null
+    private var dragStartY: Int? = null
+    private var dragEndX: Int? = null
+    private var dragEndY: Int? = null
+    private var selectionDragActive = false
+
+    data class SelectionArea(val left: Int, val top: Int, val right: Int, val bottom: Int)
+
+    private data class BoxGridBounds(val left: Int, val top: Int, val right: Int, val bottom: Int) {
+        fun contains(x: Int, y: Int) = x in left..< right && y >= top && y < bottom
+    }
+
+    private fun getBoxGridBounds(): BoxGridBounds {
+        val left = storageWidget.x
+        val top = storageWidget.y
+        return BoxGridBounds(
+            left,
+            top,
+            left + StorageWidget.SCREEN_WIDTH,
+            top + StorageWidget.SCREEN_HEIGHT
+        )
+    }
+
+    fun getSelectionArea(): SelectionArea? {
+        if (!selectionDragActive) return null
+        val startX = dragStartX ?: return null
+        val startY = dragStartY ?: return null
+        val endX = dragEndX ?: return null
+        val endY = dragEndY ?: return null
+        val bounds = getBoxGridBounds()
+        if (!bounds.contains(startX, startY)) return null
+
+        val columns = 6
+        val rows = 5
+        val slotPitch = StorageSlot.SIZE + StorageWidget.BOX_SLOT_PADDING
+        val gridLeft = bounds.left + StorageWidget.BOX_SLOT_START_OFFSET_X
+        val gridTop = bounds.top + StorageWidget.BOX_SLOT_START_OFFSET_Y + if (displayOptions) 5 else 0
+        val startColumn = ((startX - gridLeft) / slotPitch).coerceIn(0, columns - 1)
+        val endColumn = (((endX.coerceIn(bounds.left, bounds.right - 1)) - gridLeft) / slotPitch).coerceIn(0, columns - 1)
+        val startRow = ((startY - gridTop) / slotPitch).coerceIn(0, rows - 1)
+        val endRow = (((endY.coerceIn(bounds.top, bounds.bottom - 1)) - gridTop) / slotPitch).coerceIn(0, rows - 1)
+        return SelectionArea(
+            gridLeft + minOf(startColumn, endColumn) * slotPitch, // left
+            gridTop + minOf(startRow, endRow) * slotPitch, // top
+            gridLeft + (maxOf(startColumn, endColumn) * slotPitch) + StorageSlot.SIZE, // right
+            gridTop + (maxOf(startRow, endRow) * slotPitch) + StorageSlot.SIZE // bottom
+        )
+    }
+
     override fun renderBlurredBackground(delta: Float) {}
 
     override fun renderMenuBackground(context: GuiGraphics) {}
@@ -250,7 +300,7 @@ class PCGUI(
                 configuration.showParty = isVisible
                 wallpaperWidget.visible = !isVisible
                 (it as IconButton).highlighted = !isVisible
-                if (!unseenWallpapers.isEmpty()) MarkPCBoxWallpapersSeenPacket(unseenWallpapers).sendToServer()
+                if (unseenWallpapers.isNotEmpty()) MarkPCBoxWallpapersSeenPacket(unseenWallpapers).sendToServer()
             }.also {
                 it.visible = displayOptions
                 optionButtons.add(it)
@@ -315,6 +365,20 @@ class PCGUI(
         super.init()
     }
 
+    private fun renderSelectionBox(context: GuiGraphics, area: SelectionArea) {
+        context.pose().pushPose()
+        context.pose().translate(0.0, 0.0, 1500.0)
+        val borderColor = FastColor.ARGB32.color(255, 205, 212, 255)
+        val bgColor = FastColor.ARGB32.color(75, 133, 183, 230)
+        val thickness = 1
+        context.fill(area.left, area.top, area.right, area.bottom, bgColor)
+        context.fill(area.left, area.top, area.right, area.top + thickness, borderColor)
+        context.fill(area.left, area.bottom - thickness, area.right, area.bottom, borderColor)
+        context.fill(area.left, area.top, area.left + thickness, area.bottom, borderColor)
+        context.fill(area.right - thickness, area.top, area.right, area.bottom, borderColor)
+        context.pose().popPose()
+    }
+
     override fun render(context: GuiGraphics, mouseX: Int, mouseY: Int, delta: Float) {
         val matrices = context.pose()
         renderBackground(context, mouseX, mouseY, delta)
@@ -685,12 +749,14 @@ class PCGUI(
             scale = SCALE
         )
 
-        if (!optionButtons.isEmpty() && displayOptions) {
+        if (optionButtons.isNotEmpty() && displayOptions) {
             for (button in optionButtons) button.showAlt = hasShiftDown()
         }
 
         super.render(context, mouseX, mouseY, delta)
 
+        getSelectionArea()?.let { renderSelectionBox(context, it) }
+
         // Item Tooltip
         if (pokemon != null) {
             val displayedItem = if (showCosmeticItem) pokemon.cosmeticItem else pokemon.heldItemNoCopy()
@@ -712,6 +778,20 @@ class PCGUI(
     }
 
     override fun mouseClicked(mouseX: Double, mouseY: Double, button: Int): Boolean {
+        storageWidget.clearPendingStorageSlotClick()
+        selectionDragActive = false
+        val clickX = mouseX.toInt()
+        val clickY = mouseY.toInt()
+        if (storageWidget.multiSelection == null && button == 0 &&
+            getBoxGridBounds().contains(clickX, clickY) &&
+            storageWidget.pastureWidget == null) {
+            dragStartX = clickX
+            dragStartY = clickY
+        } else {
+            dragStartX = null
+            dragStartY = null
+        }
+
         // Trigger child component function as they will need to check the entire screen click area
         if (::boxNameWidget.isInitialized) boxNameWidget.mouseClicked(mouseX, mouseY, button)
         return super.mouseClicked(mouseX, mouseY, button)
@@ -740,9 +820,43 @@ class PCGUI(
         storageWidget.pastureWidget?.let { pasture ->
             if (pasture.pastureScrollList.isHovered) pasture.pastureScrollList.mouseDragged(mouseX, mouseY, button, deltaX, deltaY)
         }
+        if (button == 0 && storageWidget.pastureWidget == null) {
+            val startX = dragStartX
+            val startY = dragStartY
+            if (startX != null && startY != null) {
+                val offsetX = mouseX - startX
+                val offsetY = mouseY - startY
+                if (offsetX * offsetX + offsetY * offsetY >= 25.0) {
+                    selectionDragActive = true
+                    storageWidget.clearPendingStorageSlotClick()
+                    dragEndX = mouseX.toInt()
+                    dragEndY = mouseY.toInt()
+                }
+            }
+        }
         return super.mouseDragged(mouseX, mouseY, button, deltaX, deltaY)
     }
 
+    override fun mouseReleased(mouseX: Double, mouseY: Double, button: Int): Boolean {
+        val handled = super.mouseReleased(mouseX, mouseY, button)
+        if (button == 0) {
+            if (selectionDragActive) {
+                dragEndX = mouseX.toInt()
+                dragEndY = mouseY.toInt()
+                storageWidget.updateSelection()
+                storageWidget.clearPendingStorageSlotClick()
+            } else {
+                storageWidget.completePendingStorageSlotClick(mouseX, mouseY)
+            }
+        }
+        dragStartX = null
+        dragStartY = null
+        dragEndX = null
+        dragEndY = null
+        selectionDragActive = false
+        return handled
+    }
+
     override fun keyPressed(keyCode: Int, scanCode: Int, modifiers: Int): Boolean {
         val boxNameFocused = this::boxNameWidget.isInitialized && boxNameWidget.isFocused
         val filterFocused = this::filterWidget.isInitialized && filterWidget.isFocused

common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/PCMultiSelection.kt

@@ -0,0 +1,37 @@
+package com.cobblemon.mod.common.client.gui.pc
+
+import com.cobblemon.mod.common.pokemon.Pokemon
+
+data class PCMultiSelection(
+    private val grid: MutableList<MutableList<Pokemon?>> = mutableListOf(),
+    val sourceBox: Int = 0,
+    val sourceColumn: Int = 0,
+    val sourceRow: Int = 0
+) {
+    fun getHorizontalSize(): Int = grid.firstOrNull()?.size ?: 0
+    fun getVerticalSize(): Int = grid.size
+
+    constructor(horizontalSize: Int, verticalSize: Int, sourceBox: Int, sourceColumn: Int, sourceRow: Int) : this(
+        MutableList(verticalSize) { MutableList<Pokemon?>(horizontalSize) { null } },
+        sourceBox,
+        sourceColumn,
+        sourceRow
+    )
+
+    fun getPokemon(x: Int, y: Int): Pokemon? {
+        return grid[y][x]
+    }
+
+    fun setPokemon(x: Int, y: Int, pokemon: Pokemon?) {
+        grid[y][x] = pokemon
+    }
+
+    fun pokemonEntries(): List<Triple<Int, Int, Pokemon>> {
+        return grid.flatMapIndexed { y, row ->
+            row.mapIndexedNotNull { x, pokemon -> pokemon?.let { Triple(x, y, it) } }
+        }
+    }
+
+    fun getPokemonCount(): Int = pokemonEntries().size
+
+}

common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/ReleaseButton.kt

@@ -45,11 +45,13 @@ class ReleaseButton(
                 vOffset = if (isHovered(mouseX.toDouble(), mouseY.toDouble())) HEIGHT else 0,
                 textureHeight = HEIGHT * 2
             )
+            val pokemonCount = parent.multiSelection?.getPokemonCount() ?: 0
 
             drawScaledText(
                 context = context,
                 font = CobblemonResources.DEFAULT_LARGE,
-                text = lang("ui.pc.release").bold(),
+                text = if (pokemonCount > 1)
+                    { lang("ui.pc.release_all").bold() } else { lang("ui.pc.release").bold() },
                 x = x + (WIDTH / 2),
                 y = y + 3.5,
                 centered = true,

common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/StorageSlot.kt

@@ -9,6 +9,7 @@
 package com.cobblemon.mod.common.client.gui.pc
 
 import com.cobblemon.mod.common.Cobblemon
+import com.cobblemon.mod.common.api.gui.ColourLibrary
 import com.cobblemon.mod.common.api.gui.blitk
 import com.cobblemon.mod.common.client.gui.CobblemonRenderable
 import com.cobblemon.mod.common.client.gui.drawProfilePokemon
@@ -54,9 +55,17 @@ open class StorageSlot(
     }
 
     override fun renderWidget(context: GuiGraphics, mouseX: Int, mouseY: Int, delta: Float) {
+        val selectionArea = parent.pcGui.getSelectionArea()
+        if (selectionArea != null && parent.getSelectedPokemon(selectionArea).contains(this)) {
+            val highlightColor = 0x40FFFFFF
+            context.fill(x + 1, y, x + (SIZE - 1), y + SIZE, highlightColor)
+            context.fill(x, y + 1, x + 1, y + (SIZE - 1), highlightColor)
+            context.fill(x + SIZE - 1, y + 1, x + SIZE, y + (SIZE - 1), highlightColor)
+        }
         if (shouldRender()) {
             renderSlot(context, x, y, delta)
         }
+
     }
 
     fun renderSlot(context: GuiGraphics, posX: Int, posY: Int, partialTicks: Float) {

common/src/main/kotlin/com/cobblemon/mod/common/client/gui/pc/StorageWidget.kt

@@ -11,7 +11,6 @@ package com.cobblemon.mod.common.client.gui.pc
 import com.cobblemon.mod.common.CobblemonNetwork
 import com.cobblemon.mod.common.CobblemonSounds
 import com.cobblemon.mod.common.api.gui.blitk
-import com.cobblemon.mod.common.api.storage.StorePosition
 import com.cobblemon.mod.common.api.storage.party.PartyPosition
 import com.cobblemon.mod.common.api.storage.pc.PCPosition
 import com.cobblemon.mod.common.api.text.bold
@@ -39,8 +38,9 @@ import net.minecraft.client.gui.components.Button
 import net.minecraft.client.gui.screens.Screen
 import net.minecraft.client.resources.sounds.SimpleSoundInstance
 import net.minecraft.network.chat.Component
-import net.minecraft.resources.ResourceLocation
 import net.minecraft.sounds.SoundEvent
+import java.util.UUID
+import com.cobblemon.mod.common.net.messages.server.storage.pc.MovePCPokemonBatchPacket.PCPokemonMove
 
 class StorageWidget(
     pX: Int, pY: Int,
@@ -77,9 +77,13 @@ class StorageWidget(
 
     var displayConfirmRelease = false
     var screenLoaded = false
-    var selectedPosition: StorePosition? = null
+    var selectedPosition: PartyPosition? = null
     var grabbedSlot: GrabbedStorageSlot? = null
 
+    var multiSelection: PCMultiSelection? = null
+    private val multiGrabbedSlots = mutableMapOf<UUID, GrabbedStorageSlot>()
+    private var pendingStorageSlotClick: Button? = null
+
     var box = 0
         set(value) {
             field =
@@ -113,16 +117,22 @@ class StorageWidget(
             subKey = "ui.generic.yes",
             onPress = {
                 if (canDeleteSelected() && displayConfirmRelease) {
-                    val position = selectedPosition ?: return@ReleaseConfirmButton
-                    val pokemon = getSelectedPokemon() ?: return@ReleaseConfirmButton
+                    val selection = multiSelection
+                    if (selection != null) {
+                        selection.pokemonEntries().forEach { (column, row, pokemon) ->
+                            val position = PCPosition(
+                                selection.sourceBox,
+                                (selection.sourceRow + row) * 6 + selection.sourceColumn + column
+                            )
+                            CobblemonNetwork.sendToServer(ReleasePCPokemonPacket(pokemon.uuid, position))
+                        }
+                    } else {
+                        val position = selectedPosition ?: return@ReleaseConfirmButton
+                        val pokemon = getSelectedPokemon() ?: return@ReleaseConfirmButton
 
-                    val packet = when (position) {
-                        is PartyPosition -> ReleasePartyPokemonPacket(pokemon.uuid, position)
-                        is PCPosition -> ReleasePCPokemonPacket(pokemon.uuid, position)
-                        else -> return@ReleaseConfirmButton
+                        CobblemonNetwork.sendToServer(ReleasePartyPokemonPacket(pokemon.uuid, position))
                     }
 
-                    CobblemonNetwork.sendToServer(packet)
                     playSound(CobblemonSounds.PC_RELEASE)
                     resetSelected()
                     displayConfirmRelease = false
@@ -149,9 +159,8 @@ class StorageWidget(
     }
 
     fun canDeleteSelected(): Boolean {
-        return !(selectedPosition is PartyPosition && party.filterNotNull().size <= 1)
-                && selectedPosition != null
-                && grabbedSlot != null
+        multiSelection?.let { return it.pokemonEntries().isNotEmpty() }
+        return party.filterNotNull().size > 1 && selectedPosition != null && grabbedSlot != null
     }
 
     fun setupStorageSlots() {
@@ -170,7 +179,7 @@ class StorageWidget(
                     parent = this,
                     pc = pc,
                     position = PCPosition(box, index),
-                    onPress = { this.onStorageSlotClicked(it) }
+                    onPress = { pendingStorageSlotClick = it }
                 ).also {  widget ->
                     this.addWidget(widget)
                     this.boxSlots.add(widget)
@@ -200,7 +209,7 @@ class StorageWidget(
                 parent = this,
                 party = party,
                 position = PartyPosition(partyIndex),
-                onPress = { this.onStorageSlotClicked(it) }
+                onPress = { pendingStorageSlotClick = it }
             ).also { widget ->
                 this.addWidget(widget)
                 this.partySlots.add(widget)
@@ -210,13 +219,115 @@ class StorageWidget(
 
     private fun getSelectedPokemon(): Pokemon? {
         val selectedPosition = this.selectedPosition ?: return null
-        return when (selectedPosition) {
-            is PCPosition -> pc.get(selectedPosition)
-            is PartyPosition -> party.get(selectedPosition)
-            else -> null
+        return party.get(selectedPosition)
+    }
+
+    fun getSelectedPokemon(area: PCGUI.SelectionArea): List<BoxStorageSlot> {
+        return boxSlots.filter { slot ->
+            slot.x < area.right && slot.x + StorageSlot.SIZE > area.left &&
+                slot.y < area.bottom && slot.y + StorageSlot.SIZE > area.top &&
+                slot.getPokemon()?.let(pcGui.search::passes) == true
         }
     }
 
+    fun clearPendingStorageSlotClick() {
+        pendingStorageSlotClick = null
+    }
+
+    fun completePendingStorageSlotClick(mouseX: Double, mouseY: Double) {
+        val button = pendingStorageSlotClick ?: return
+        pendingStorageSlotClick = null
+        if (button.isMouseOver(mouseX, mouseY)) {
+            onStorageSlotClicked(button)
+        }
+    }
+
+    fun updateSelection() {
+        val area = pcGui.getSelectionArea()
+        if (area == null) {
+            multiSelection = null
+            return
+        }
+
+        selectedPosition = null
+        grabbedSlot = null
+        pcGui.setPreviewPokemon(null)
+
+        val selectedSlots = getSelectedPokemon(area)
+        if (selectedSlots.isEmpty()) {
+            multiSelection = null
+            return
+        }
+
+        val minColumn = selectedSlots.minOf { it.position.slot % 6 }
+        val maxColumn = selectedSlots.maxOf { it.position.slot % 6 }
+        val minRow = selectedSlots.minOf { it.position.slot / 6 }
+        val maxRow = selectedSlots.maxOf { it.position.slot / 6 }
+        val selection = PCMultiSelection(maxColumn - minColumn + 1, maxRow - minRow + 1, box, minColumn, minRow)
+
+        selectedSlots.forEach { slot ->
+            val pokemon = slot.getPokemon() ?: return@forEach
+            val slotIndex = slot.position.slot
+            val column = slotIndex % 6
+            val row = slotIndex / 6
+            if (column in minColumn..maxColumn && row in minRow..maxRow) {
+                selection.setPokemon(column - minColumn, row - minRow, pokemon)
+            }
+        }
+        playSound(CobblemonSounds.PC_GRAB)
+
+        multiSelection = selection
+    }
+
+    private fun moveMultiSelectionTo(destination: PCPosition): Boolean {
+        val selection = multiSelection ?: return false
+
+        val width = selection.getHorizontalSize()
+        val height = selection.getVerticalSize()
+        val destinationColumn = destination.slot % 6
+        val destinationRow = destination.slot / 6
+        if (destinationColumn + width > 6 || destinationRow + height > 5) return false
+
+        val moves = mutableListOf<PCPokemonMove>()
+        val selectedSources = mutableSetOf<PCPosition>()
+        for (row in 0 until height) {
+            for (column in 0 until width) {
+                val pokemon = selection.getPokemon(column, row) ?: continue
+                val source = PCPosition(selection.sourceBox, (selection.sourceRow + row) * 6 + selection.sourceColumn + column)
+                val target = PCPosition(destination.box, (destinationRow + row) * 6 + destinationColumn + column)
+                selectedSources.add(source)
+                moves.add(PCPokemonMove(pokemon.uuid, source, target))
+            }
+        }
+
+        if (moves.isEmpty()) return false
+
+        for (row in 0 until height) {
+            for (column in 0 until width) {
+                if (selection.getPokemon(column, row) == null) continue
+                val target = PCPosition(destination.box, (destinationRow + row) * 6 + destinationColumn + column)
+                val displacedPokemon = pc.get(target) ?: continue
+                if (target in selectedSources) continue
+
+                val displacedSource = PCPosition(
+                    selection.sourceBox,
+                    (selection.sourceRow + row) * 6 + selection.sourceColumn + column
+                )
+                if (pc.get(displacedSource) != null && displacedSource !in selectedSources) return false
+                moves.add(PCPokemonMove(displacedPokemon.uuid, target, displacedSource))
+            }
+        }
+
+        if (moves.map { it.newPosition }.toSet().size != moves.size) return false
+        MovePCPokemonBatchPacket(moves).sendToServer()
+        return true
+    }
+
+    fun isInMultiSelection(pokemon: Pokemon, position: PCPosition): Boolean {
+        val selection = multiSelection ?: return false
+        return selection.sourceBox == position.box && selection.pokemonEntries().any { it.third == pokemon }
+    }
+
     override fun renderWidget(context: GuiGraphics, mouseX: Int, mouseY: Int, delta: Float) {
         val matrices = context.pose()
         // Party  Label
@@ -240,11 +351,14 @@ class StorageWidget(
                 shadow = true
             )
 
+            val pokemonCount = multiSelection?.getPokemonCount() ?: 0
+
             if (canDeleteSelected() && displayConfirmRelease) {
                 drawScaledText(
                     context = context,
                     font = CobblemonResources.DEFAULT_LARGE,
-                    text = lang("ui.pc.release").bold(),
+                    text = if (pokemonCount > 1)
+                    { lang("ui.pc.release_all").bold() } else { lang("ui.pc.release").bold() },
                     x = x + 223,
                     y = y + 119,
                     centered = true
@@ -308,6 +422,7 @@ class StorageWidget(
                 slot.render(context, mouseX, mouseY, delta)
                 val pokemon = slot.getPokemon()
                 if (grabbedSlot == null && slot.isHovered(mouseX, mouseY)
+                    && multiSelection == null
                     && pokemon != null && pokemon != pcGui.previewPokemon
                 ) {
                     pcGui.setPreviewPokemon(pokemon, pcGui.isPreviewInParty ?: false)
@@ -324,6 +439,7 @@ class StorageWidget(
                 slot.render(context, mouseX, mouseY, delta)
                 val pokemon = slot.getPokemon()
                 if (grabbedSlot == null && slot.isHovered(mouseX, mouseY)
+                    && multiSelection == null
                     && pokemon != null && pokemon != pcGui.previewPokemon
                 ) {
                     pcGui.setPreviewPokemon(pokemon, pcGui.isPreviewInParty ?: true)
@@ -335,10 +451,31 @@ class StorageWidget(
         pastureWidget?.render(context, mouseX, mouseY, delta)
         matrices.pushPose()
         matrices.translate(0.0, 0.0, 1000.0)
-        grabbedSlot?.render(context, mouseX, mouseY, delta)
+        renderSelectedPokemon(context, mouseX, mouseY, delta)
         matrices.popPose()
     }
 
+    private fun renderSelectedPokemon(context: GuiGraphics, mouseX: Int, mouseY: Int, delta: Float) {
+        val selection = multiSelection
+        if (selection == null) {
+            grabbedSlot?.render(context, mouseX, mouseY, delta)
+            return
+        }
+
+        val slotOffset = StorageSlot.SIZE + BOX_SLOT_PADDING
+        selection.pokemonEntries().forEach { (column, row, pokemon) ->
+            val grabbed = multiGrabbedSlots.getOrPut(pokemon.uuid) {
+                GrabbedStorageSlot(0, 0, this, pokemon)
+            }
+            grabbed.render(
+                context,
+                mouseX + column * slotOffset,
+                mouseY + row * slotOffset,
+                delta
+            )
+        }
+    }
+
     override fun mouseClicked(pMouseX: Double, pMouseY: Double, pButton: Int): Boolean {
         if (displayConfirmRelease) {
             if (releaseYesButton.isHovered(pMouseX, pMouseY)) releaseYesButton.mouseClicked(pMouseX, pMouseY, pButton)
@@ -371,23 +508,55 @@ class StorageWidget(
             else -> return
         }
 
+        val clickedPokemon = when (clickedPosition) {
+            is PCPosition -> pc.get(clickedPosition)
+            is PartyPosition -> party.get(clickedPosition)
+            else -> null
+        }
+
+        multiSelection?.let { selection ->
+            when (clickedPosition) {
+                is PCPosition -> {
+                    if (clickedPosition.box == selection.sourceBox &&
+                        clickedPosition.slot == selection.sourceRow * 6 + selection.sourceColumn
+                    ) {
+                        resetSelected()
+                    } else if (moveMultiSelectionTo(clickedPosition)) {
+                        playSound(CobblemonSounds.PC_DROP)
+                        resetSelected()
+                    }
+                }
+                is PartyPosition -> {
+                    val selectedPokemon = selection.pokemonEntries().singleOrNull() ?: return
+                    val (column, row, pokemon) = selectedPokemon
+                    val source = PCPosition(
+                        selection.sourceBox,
+                        (selection.sourceRow + row) * 6 + selection.sourceColumn + column
+                    )
+                    if (pc.get(source) !== pokemon) return
+                    val packet = clickedPokemon?.let {
+                        SwapPCPartyPokemonPacket(it.uuid, clickedPosition, pokemon.uuid, source)
+                    } ?: MovePCPokemonToPartyPacket(pokemon.uuid, source, clickedPosition)
+                    packet.sendToServer()
+                    playSound(CobblemonSounds.PC_DROP)
+                    resetSelected()
+                }
+                else -> Unit
+            }
+            return
+        }
+
         // Reset release confirmation
         displayConfirmRelease = false
 
         // Clicking on itself, so unselect position
-        if (this.selectedPosition != null && this.selectedPosition == clickedPosition) {
+        if (selectedPosition == clickedPosition) {
             if (grabbedSlot != null) playSound(CobblemonSounds.PC_DROP)
             resetSelected()
             return
         }
 
         // Check for selecting a Pokémon
-        val clickedPokemon = when(button) {
-            is BoxStorageSlot -> pc.get(clickedPosition as PCPosition)
-            is PartyStorageSlot -> party.get(clickedPosition as PartyPosition)
-            else -> null
-        }
-
         val selectOverride = pcGui.configuration.selectOverride
         if (selectOverride != null) {
             selectOverride(pcGui, clickedPosition, clickedPokemon)
@@ -420,56 +589,44 @@ class StorageWidget(
                     }
                 }
 
-                this.selectedPosition = clickedPosition
-                this.pcGui.setPreviewPokemon(clickedPokemon, pcGui.isPreviewInParty ?: false)
-                grabbedSlot = GrabbedStorageSlot(
-                    x = button.x,
-                    y = button.y,
-                    parent = this,
-                    pokemon = clickedPokemon
-                )
-                playSound(CobblemonSounds.PC_GRAB)
-
+                if (clickedPosition is PCPosition) {
+                    val column = clickedPosition.slot % 6
+                    val row = clickedPosition.slot / 6
+                    multiSelection = PCMultiSelection(1, 1, clickedPosition.box, column, row).also {
+                        it.setPokemon(0, 0, clickedPokemon)
+                    }
+                    playSound(CobblemonSounds.PC_GRAB)
+                    return
+                } else if (clickedPosition is PartyPosition) {
+                    this.selectedPosition = clickedPosition
+                    this.pcGui.setPreviewPokemon(clickedPokemon, pcGui.isPreviewInParty ?: false)
+                    grabbedSlot = GrabbedStorageSlot(
+                        x = button.x,
+                        y = button.y,
+                        parent = this,
+                        pokemon = clickedPokemon
+                    )
+                    playSound(CobblemonSounds.PC_GRAB)
+                }
             }
         } else  {
-            // Handle movement within the Box
-            val selectedPokemon = when(this.selectedPosition) {
-                is PCPosition -> pc.get(this.selectedPosition as PCPosition)
-                is PartyPosition -> party.get(this.selectedPosition as PartyPosition)
-                else -> null
-            } ?: return
-
-            // Box to Box
-            if (this.selectedPosition is PCPosition && clickedPosition is PCPosition) {
-                val packet = clickedPokemon?.let { SwapPCPokemonPacket(it.uuid, clickedPosition, selectedPokemon.uuid, this.selectedPosition as PCPosition) }
-                    ?: MovePCPokemonPacket(selectedPokemon.uuid, selectedPosition as PCPosition, clickedPosition)
-                packet.sendToServer()
-                playSound(CobblemonSounds.PC_DROP)
-                resetSelected()
-            }
-            // Box to Party
-            else if (this.selectedPosition is PCPosition && clickedPosition is PartyPosition) {
-                val packet = clickedPokemon?.let { SwapPCPartyPokemonPacket(clickedPokemon.uuid, clickedPosition, selectedPokemon.uuid, this.selectedPosition as PCPosition) }
-                    ?: MovePCPokemonToPartyPacket(selectedPokemon.uuid, this.selectedPosition as PCPosition, clickedPosition)
-                packet.sendToServer()
-                playSound(CobblemonSounds.PC_DROP)
-                resetSelected()
-            }
+            val sourcePosition = selectedPosition ?: return
+            val selectedPokemon = party.get(sourcePosition) ?: return
             // Party to Box
-            else if (this.selectedPosition is PartyPosition && clickedPosition is PCPosition) {
+            if (clickedPosition is PCPosition) {
                 if (ServerSettings.preventCompletePartyDeposit && this.party.filterNotNull().size == 1 && clickedPokemon == null) {
                     return
                 }
-                val packet = clickedPokemon?.let { SwapPCPartyPokemonPacket(selectedPokemon.uuid, this.selectedPosition as PartyPosition, clickedPokemon.uuid, clickedPosition) }
-                    ?: MovePartyPokemonToPCPacket(selectedPokemon.uuid, this.selectedPosition as PartyPosition, clickedPosition)
+                val packet = clickedPokemon?.let { SwapPCPartyPokemonPacket(selectedPokemon.uuid, sourcePosition, clickedPokemon.uuid, clickedPosition) }
+                    ?: MovePartyPokemonToPCPacket(selectedPokemon.uuid, sourcePosition, clickedPosition)
                 packet.sendToServer()
                 playSound(CobblemonSounds.PC_DROP)
                 resetSelected()
             }
             // Party to Party
-            else if (this.selectedPosition is PartyPosition && clickedPosition is PartyPosition) {
-                val packet = clickedPokemon?.let { SwapPartyPokemonPacket(it.uuid, clickedPosition, selectedPokemon.uuid, this.selectedPosition as PartyPosition) }
-                    ?: MovePartyPokemonPacket(selectedPokemon.uuid, selectedPosition as PartyPosition, clickedPosition)
+            else if (clickedPosition is PartyPosition) {
+                val packet = clickedPokemon?.let { SwapPartyPokemonPacket(it.uuid, clickedPosition, selectedPokemon.uuid, sourcePosition) }
+                    ?: MovePartyPokemonPacket(selectedPokemon.uuid, sourcePosition, clickedPosition)
                 packet.sendToServer()
                 playSound(CobblemonSounds.PC_DROP)
                 resetSelected()
@@ -480,6 +637,8 @@ class StorageWidget(
     fun resetSelected() {
         selectedPosition = null
         grabbedSlot = null
+        multiSelection = null
+        multiGrabbedSlots.clear()
         pcGui.setPreviewPokemon(null)
     }
 }

common/src/main/kotlin/com/cobblemon/mod/common/net/messages/server/storage/pc/MovePCPokemonBatchPacket.kt

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2023 Cobblemon Contributors
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://www.mozilla.org/MPL/2.0/.
+ */
+
+package com.cobblemon.mod.common.net.messages.server.storage.pc
+
+import com.cobblemon.mod.common.api.net.NetworkPacket
+import com.cobblemon.mod.common.api.storage.pc.PCPosition
+import com.cobblemon.mod.common.util.cobblemonResource
+import com.cobblemon.mod.common.util.readPCPosition
+import com.cobblemon.mod.common.util.writePCPosition
+import java.util.UUID
+import net.minecraft.network.RegistryFriendlyByteBuf
+
+class MovePCPokemonBatchPacket(val moves: List<PCPokemonMove>) : NetworkPacket<MovePCPokemonBatchPacket> {
+    override val id = ID
+
+    data class PCPokemonMove(
+        val pokemonID: UUID,
+        val oldPosition: PCPosition,
+        val newPosition: PCPosition
+    )
+
+    override fun encode(buffer: RegistryFriendlyByteBuf) {
+        buffer.writeVarInt(moves.size)
+        moves.forEach { move ->
+            buffer.writeUUID(move.pokemonID)
+            buffer.writePCPosition(move.oldPosition)
+            buffer.writePCPosition(move.newPosition)
+        }
+    }
+
+    companion object {
+        val ID = cobblemonResource("move_pc_pokemon_batch")
+        const val MAX_MOVES = 60
+
+        fun decode(buffer: RegistryFriendlyByteBuf): MovePCPokemonBatchPacket {
+            val size = buffer.readVarInt()
+            require(size in 1..MAX_MOVES) { "Invalid batch PC move size: $size" }
+            return MovePCPokemonBatchPacket(
+                List(size) {
+                    PCPokemonMove(
+                        pokemonID = buffer.readUUID(),
+                        oldPosition = buffer.readPCPosition(),
+                        newPosition = buffer.readPCPosition()
+                    )
+                }
+            )
+        }
+    }
+}

common/src/main/kotlin/com/cobblemon/mod/common/net/serverhandling/storage/pc/MovePCPokemonBatchHandler.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2023 Cobblemon Contributors
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://www.mozilla.org/MPL/2.0/.
+ */
+
+package com.cobblemon.mod.common.net.serverhandling.storage.pc
+
+import com.cobblemon.mod.common.api.net.ServerNetworkPacketHandler
+import com.cobblemon.mod.common.api.storage.pc.link.PCLinkManager
+import com.cobblemon.mod.common.net.messages.client.storage.pc.ClosePCPacket
+import com.cobblemon.mod.common.net.messages.server.storage.pc.MovePCPokemonBatchPacket
+import net.minecraft.server.MinecraftServer
+import net.minecraft.server.level.ServerPlayer
+
+object MovePCPokemonBatchHandler : ServerNetworkPacketHandler<MovePCPokemonBatchPacket> {
+    override fun handle(packet: MovePCPokemonBatchPacket, server: MinecraftServer, player: ServerPlayer) {
+        val pc = PCLinkManager.getPC(player) ?: return run { ClosePCPacket(null).sendToPlayer(player) }
+        pc.moveBatch(packet.moves.map { Triple(it.pokemonID, it.oldPosition, it.newPosition) })
+    }
+}

common/src/main/resources/assets/cobblemon/lang/en_us.json

@@ -1299,6 +1299,7 @@
   "cobblemon.ui.pc.filter.tooltip": "Format: pikachu shiny held_item lvl=1...",
   "cobblemon.ui.pc.options": "Options",
   "cobblemon.ui.pc.release": "Release",
+  "cobblemon.ui.pc.release_all": "Release All",
   "cobblemon.ui.sort.name": "Sort by name",
   "cobblemon.ui.sort.level": "Sort by level",
   "cobblemon.ui.sort.pokedex_number": "Sort by Pokédex number",