diff --git a/src/battle_terastal.c b/src/battle_terastal.c
index 9734833d4e..5f9277b025 100644
--- a/src/battle_terastal.c
+++ b/src/battle_terastal.c
@@ -63,19 +63,21 @@ bool32 CanTerastallize(u32 battler)
 {
     u32 holdEffect = GetBattlerHoldEffect(battler, FALSE);
 
-    if (GetBattlerSide(battler) == B_SIDE_PLAYER)
+    if (TESTING || GetBattlerSide(battler) == B_SIDE_OPPONENT)
     {
-        // Check if Player has Tera Orb and has charge.
-        if (!TESTING && !CheckBagHasItem(ITEM_TERA_ORB, 1))
-            return FALSE;
-
-        if (!TESTING
-        && !(B_FLAG_TERA_ORB_NO_COST != 0 && FlagGet(B_FLAG_TERA_ORB_NO_COST))
-        && (battler == B_POSITION_PLAYER_LEFT || (!(gBattleTypeFlags & BATTLE_TYPE_MULTI) && battler == B_POSITION_PLAYER_RIGHT)))
-        {
-            if (B_FLAG_TERA_ORB_CHARGED != 0 && !FlagGet(B_FLAG_TERA_ORB_CHARGED))
-                return FALSE;
-        }
+        // Skip all other checks in this block, go to HasTrainerUsedGimmick
+    }
+    else if (!CheckBagHasItem(ITEM_TERA_ORB, 1))
+    {
+        return FALSE;
+    }
+    else if (FlagGet(B_FLAG_TERA_ORB_NO_COST))
+    {
+        // Tera Orb is not depleted, go to HasTrainerUsedGimmick
+    }
+    else if (!FlagGet(B_FLAG_TERA_ORB_CHARGED))
+    {
+        return FALSE;
     }
 
     // Check if Trainer has already Terastallized.