Fixes Destiny Bond against Dynamax no failing (#6501)

src/battle_script_commands.c

@@ -13864,10 +13864,29 @@ static void Cmd_trychoosesleeptalkmove(void)
     }
 }
 
+static inline bool32 IsDanamaxMonPresent(void)
+{
+    for (u32 battler = 0; battler < gBattlersCount; battler++)
+    {
+        if (battler == gBattlerAttacker)
+            continue;
+
+        if (GetActiveGimmick(battler) == GIMMICK_DYNAMAX)
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
 static void Cmd_trysetdestinybond(void)
 {
     CMD_ARGS(const u8 *failInstr);
-    if (DoesDestinyBondFail(gBattlerAttacker))
+
+    if (IsDanamaxMonPresent())
+    {
+        gBattlescriptCurrInstr = BattleScript_MoveBlockedByDynamax;
+    }
+    else if (DoesDestinyBondFail(gBattlerAttacker))
     {
         gBattlescriptCurrInstr = cmd->failInstr;
     }

test/battle/gimmick/dynamax.c

@@ -1624,3 +1624,15 @@ SINGLE_BATTLE_TEST("Dynamax: Dynamax is reverted before switch out")
         MESSAGE("Wobbuffet used Tackle!");
     }
 }
+
+SINGLE_BATTLE_TEST("Dynamax: Destiny Bond if a dynamaxed battler is present on field")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_DESTINY_BOND); MOVE(player, MOVE_TACKLE, gimmick: GIMMICK_DYNAMAX); }
+    } SCENE {
+        MESSAGE("The move was blocked by the power of Dynamax!");
+    }
+}