Renamed constant,

src/battle_controller_player.c

@@ -316,7 +316,7 @@ static void HandleInputChooseAction(void)
             if (gBattleBufferA[gActiveBattler][1] == B_ACTION_USE_ITEM)
             {
                 // Add item to bag if it is a ball
-                if (itemId <= END_BALLS)
+                if (itemId <= LAST_BALL)
                     AddBagItem(itemId, 1);
                 else
                     return;

src/battle_main.c

@@ -5547,7 +5547,7 @@ static void HandleAction_UseItem(void)
     ClearFuryCutterDestinyBondGrudge(gBattlerAttacker);
     gLastUsedItem = gBattleBufferB[gBattlerAttacker][1] | (gBattleBufferB[gBattlerAttacker][2] << 8);
 
-    if (gLastUsedItem <= END_BALLS) // is ball
+    if (gLastUsedItem <= LAST_BALL) // is ball
     {
         gBattlescriptCurrInstr = gBattlescriptsForBallThrow[gLastUsedItem];
     }