through sub_8113FBC

include/constants/items.h

@@ -393,4 +393,11 @@
 // Check if the item is one that can be used on a Pokemon.
 #define IS_POKEMON_ITEM(item) ((item) >= ITEM_POTION && (item) <= ITEM_0B2)
 
+// POCKETS
+#define POCKET_ITEMS       1
+#define POCKET_KEY_ITEMS   2
+#define POCKET_POKE_BALLS  3
+#define POCKET_TM_CASE     4
+#define POCKET_BERRY_POUCH 5
+
 #endif  // GUARD_CONSTANTS_ITEMS_H

include/party_menu.h

@@ -14,5 +14,6 @@ bool8 pokemon_has_move(struct Pokemon *, u16);
 void sub_81B58A8(void);
 void DoWallyTutorialBagMenu(void);
 u8 pokemon_ailments_get_primary(u32 status);
+u16 ItemIdToBattleMoveId(u16 itemId);
 
 #endif // GUARD_PARTY_MENU_H