diff --git a/src/data/items.h b/src/data/items.h
index b0b53c31f..78d2e72ab 100644
--- a/src/data/items.h
+++ b/src/data/items.h
@@ -3193,7 +3193,6 @@ const struct Item gItems[] =
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange_ConsumedOnUse,
-        .secondaryId = FORM_ITEM_USE,
         .flingPower = 10,
     },
 
@@ -3207,7 +3206,6 @@ const struct Item gItems[] =
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange_ConsumedOnUse,
-        .secondaryId = FORM_ITEM_USE,
         .flingPower = 10,
     },
 
@@ -3221,7 +3219,6 @@ const struct Item gItems[] =
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange_ConsumedOnUse,
-        .secondaryId = FORM_ITEM_USE,
         .flingPower = 10,
     },
 
@@ -3235,7 +3232,6 @@ const struct Item gItems[] =
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange_ConsumedOnUse,
-        .secondaryId = FORM_ITEM_USE,
         .flingPower = 10,
     },
 
@@ -9071,7 +9067,6 @@ const struct Item gItems[] =
         .pocket = POCKET_KEY_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE,
     },
 
     [ITEM_REVEAL_GLASS] =
@@ -9083,7 +9078,6 @@ const struct Item gItems[] =
         .pocket = POCKET_KEY_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE,
     },
 
     [ITEM_DNA_SPLICERS] =
@@ -9093,9 +9087,8 @@ const struct Item gItems[] =
         .price = 0,
         .description = sDNASplicersDesc,
         .pocket = POCKET_KEY_ITEMS,
-        .type = ITEM_USE_PARTY_MENU,
-        .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE,
+        .type = ITEM_USE_BAG_MENU,
+        .fieldUseFunc = ItemUseOutOfBattle_CannotUse, // Todo: ItemUseOutOfBattle_FormChange_Fusion
     },
 
     [ITEM_ZYGARDE_CUBE] =
@@ -9119,7 +9112,6 @@ const struct Item gItems[] =
         .pocket = POCKET_KEY_ITEMS,
         .type = ITEM_USE_PARTY_MENU,
         .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE,
     },
 
     [ITEM_N_SOLARIZER] =
@@ -9129,9 +9121,8 @@ const struct Item gItems[] =
         .price = 0,
         .description = sNSolarizerDesc,
         .pocket = POCKET_KEY_ITEMS,
-        .type = ITEM_USE_PARTY_MENU,
-        .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE,
+        .type = ITEM_USE_BAG_MENU,
+        .fieldUseFunc = ItemUseOutOfBattle_CannotUse, // Todo: ItemUseOutOfBattle_FormChange_Fusion
     },
 
     [ITEM_N_LUNARIZER] =
@@ -9141,9 +9132,8 @@ const struct Item gItems[] =
         .price = 0,
         .description = sNLunarizerDesc,
         .pocket = POCKET_KEY_ITEMS,
-        .type = ITEM_USE_PARTY_MENU,
-        .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE,
+        .type = ITEM_USE_BAG_MENU,
+        .fieldUseFunc = ItemUseOutOfBattle_CannotUse, // Todo: ItemUseOutOfBattle_FormChange_Fusion
     },
 
     [ITEM_REINS_OF_UNITY] =
@@ -9153,9 +9143,8 @@ const struct Item gItems[] =
         .price = 0,
         .description = sReinsOfUnityDesc,
         .pocket = POCKET_KEY_ITEMS,
-        .type = ITEM_USE_PARTY_MENU,
-        .fieldUseFunc = ItemUseOutOfBattle_FormChange,
-        .secondaryId = FORM_ITEM_USE,
+        .type = ITEM_USE_BAG_MENU,
+        .fieldUseFunc = ItemUseOutOfBattle_CannotUse, // Todo: ItemUseOutOfBattle_FormChange_Fusion
     },
 
 // Battle Mechanic Key Items
diff --git a/src/party_menu.c b/src/party_menu.c
index eaeadabab..3c8b163c5 100755
--- a/src/party_menu.c
+++ b/src/party_menu.c
@@ -5591,7 +5591,7 @@ static void Task_TryItemUseFormChange(u8 taskId)
 bool32 TryItemUseFormChange(u8 taskId, TaskFunc task)
 {
     struct Pokemon *mon = &gPlayerParty[gPartyMenu.slotId];
-    u16 targetSpecies = GetFormChangeTargetSpecies(mon, ItemId_GetSecondaryId(gSpecialVar_ItemId), gSpecialVar_ItemId);
+    u16 targetSpecies = GetFormChangeTargetSpecies(mon, FORM_ITEM_USE, gSpecialVar_ItemId);
 
     if (targetSpecies != SPECIES_NONE)
     {