Additionally, transferring modified or illegitimate items, such as items with altered properties, can also cause issues and corrupt your save file. It's important to exercise caution when transferring Pokémon and items from other games or sources to avoid corrupting your game.
If you are unsure about the legitimacy of a Pokémon or item, it's best to avoid transferring it to your game. Instead, you can consider catching or obtaining Pokémon and items legitimately within the game itself or through authorized means to ensure a safe and enjoyable gaming experience.