Where can I find a mster code?
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Pkmn boy, Master Codes unlock/give you everything in games. Anyway, I'm sorry, there isn't such a cheat in Diamond and Pearl.
If you could be more specific, I might be able to help you...
As in a cheat code? The Master Code can be found in the Action replay cheats section of this website.
If you are still looking for help with this game we have more questions and answers for you to check.