Here's why:
* Mystery Gifts are unique: Each Mystery Gift is associated with a unique code or event. Once you redeem a code, it's used up and can't be redeemed again.
* Event limitations: Some Mystery Gifts are time-limited events, meaning they're only available for a specific period.
* Game design: The game is designed so that you can only receive each Mystery Gift once. This encourages players to explore different events and collect a variety of unique Pokemon and items.
However, there are some exceptions:
* Certain items: Some Mystery Gifts are items like Poke Balls or Berries. While you can't get the same Mystery Gift code again, you might be able to receive multiple copies of the same item if it's part of a different Mystery Gift event.
* Trading: You can trade Mystery Gift Pokemon with other players, allowing you to obtain copies of the same Pokemon that someone else has received.
So, while you can't get the same Mystery Gift code again, you might be able to obtain multiple copies of the same item or Pokemon through different events or trading.