Best Answer

It depends.

It seriously depends what cheat you used. If, for example, you used the shinies cheat, and you saved the game, your Pokemon will remain permanently shiny unless somebody invents an "unshiny" code or something. But if you used "Walk through walls" and saved,and you didn't select that cheat next time, nothing will happen to your game.

I'd stop using cheats though. They ruin the game.

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Q: Is it possible to undo an action replay code in Pokemon diamond?
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Related questions

Is there a Dialga doll action replay code for Pokemon diamond?

no it is not possible to have a dialga doll even if you have an action replay

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This is not possible, sorry.

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i have Pokemon diamond, and played 600 hours. its not possible. but you can catch a ditto, and make Pokemon eggs.

Where is the action replay in Pokemon Diamond?

Action replay is not an Pokémon item that can be obtained in Diamond.

Can you enter action replay codes without an action replay for Pokemon diamond?


Action Replay codes on Action Replay for Pokemon diamond?

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Can you get Oaks Letter in Pokemon Diamond without Action Replay?

no you have to get is from an action replay or go to a Pokemon event

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What is action replay in Pokemon diamond?

its a cheat

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Action replay.