diff --git a/include/item_use.h b/include/item_use.h
index f577f8d464..3bc3c2226b 100644
--- a/include/item_use.h
+++ b/include/item_use.h
@@ -23,6 +23,8 @@ void ItemUseOutOfBattle_BlackWhiteFlute(u8);
 void ItemUseOutOfBattle_EvolutionStone(u8);
 void ItemUseOutOfBattle_Berry(u8);
 void ItemUseOutOfBattle_EnigmaBerry(u8);
+void ItemUseOutOfBattle_FormChange(u8);
+void ItemUseOutOfBattle_FormChange_ConsumedOnUse(u8);
 void ItemUseOutOfBattle_CannotUse(u8);
 void ItemUseInBattle_PokeBall(u8);
 void ItemUseInBattle_StatIncrease(u8);
diff --git a/include/party_menu.h b/include/party_menu.h
index 7f51d08c9f..7ef6c2455a 100644
--- a/include/party_menu.h
+++ b/include/party_menu.h
@@ -59,6 +59,7 @@ void ItemUseCB_TMHM(u8 taskId, TaskFunc task);
 void ItemUseCB_RareCandy(u8 taskId, TaskFunc task);
 void ItemUseCB_SacredAsh(u8 taskId, TaskFunc task);
 void ItemUseCB_EvolutionStone(u8 taskId, TaskFunc task);
+void ItemUseCB_FormChange(u8 taskId, TaskFunc task);
 u8 GetItemEffectType(u16 item);
 void CB2_PartyMenuFromStartMenu(void);
 void CB2_ChooseMonToGiveItem(void);
diff --git a/src/item_use.c b/src/item_use.c
index af0ca9ee5b..785b5ad546 100755
--- a/src/item_use.c
+++ b/src/item_use.c
@@ -1118,6 +1118,20 @@ void ItemUseInBattle_EnigmaBerry(u8 taskId)
     }
 }
 
+void ItemUseOutOfBattle_FormChange(u8 taskId) 
+{
+    gItemUseCB = ItemUseCB_FormChange;
+    gTasks[taskId].data[0] = FALSE;
+    SetUpItemUseCallback(taskId);
+}
+
+void ItemUseOutOfBattle_FormChange_ConsumedOnUse(u8 taskId)
+{
+    gItemUseCB = ItemUseCB_FormChange;
+    gTasks[taskId].data[0] = TRUE;
+    SetUpItemUseCallback(taskId);
+}
+
 void ItemUseOutOfBattle_CannotUse(u8 taskId)
 {
     DisplayDadsAdviceCannotUseItemMessage(taskId, gTasks[taskId].tUsingRegisteredKeyItem);
diff --git a/src/party_menu.c b/src/party_menu.c
index 2d4432367a..fe2db7f9c4 100755
--- a/src/party_menu.c
+++ b/src/party_menu.c
@@ -409,6 +409,8 @@ static bool8 SetUpFieldMove_Dive(void);
 #include "data/pokemon/tutor_learnsets.h"
 #include "data/party_menu.h"
 
+static const u8 ChangedForm[] = _("{STR_VAR_1} changed Forme!{PAUSE_UNTIL_PRESS}");
+
 // code
 static void InitPartyMenu(u8 menuType, u8 layout, u8 partyAction, bool8 keepCursorPos, u8 messageId, TaskFunc task, MainCallback callback)
 {
@@ -5165,6 +5167,38 @@ void ItemUseCB_EvolutionStone(u8 taskId, TaskFunc task)
     }
 }
 
+void ItemUseCB_FormChange(u8 taskId, TaskFunc task)
+{
+    struct Pokemon *mon = &gPlayerParty[gPartyMenu.slotId];
+    u16 species = GetMonData(mon, MON_DATA_SPECIES);
+    u16 targetSpecies = GetFormChangeTargetSpecies(mon, FORM_ITEM_USE, gSpecialVar_ItemId);
+    if (targetSpecies != SPECIES_NONE)
+    {
+        gPartyMenuUseExitCallback = TRUE;
+        PlaySE(SE_USE_ITEM);
+        PlayCry2(targetSpecies, 0, 0x7D, 0xA);
+        SetMonData(mon, MON_DATA_SPECIES, &targetSpecies);
+        FreeAndDestroyMonIconSprite(&gSprites[sPartyMenuBoxes[gPartyMenu.slotId].monSpriteId]);
+        CreatePartyMonIconSpriteParameterized(targetSpecies, GetMonData(mon, MON_DATA_PERSONALITY, NULL), &sPartyMenuBoxes[gPartyMenu.slotId], 0);
+        CalculateMonStats(mon);
+        GetMonNickname(mon, gStringVar1);
+        StringExpandPlaceholders(gStringVar4, ChangedForm);
+        DisplayPartyMenuMessage(gStringVar4, FALSE);
+        if (gTasks[taskId].data[0] == TRUE)
+            RemoveBagItem(gSpecialVar_ItemId, 1);
+        ScheduleBgCopyTilemapToVram(2);
+        gTasks[taskId].func = task;
+    }
+    else
+    {
+        gPartyMenuUseExitCallback = FALSE;
+        PlaySE(SE_SELECT);
+        DisplayPartyMenuMessage(gText_WontHaveEffect, TRUE);
+        ScheduleBgCopyTilemapToVram(2);
+        gTasks[taskId].func = task;
+    }
+}
+
 u8 GetItemEffectType(u16 item)
 {
     const u8 *itemEffect;