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Same thing happened to me, the problem could be that the game code was entered wrong into the Action Replay, there are a few things you could do about it. You can take out you Action Replay Code Manager CD and delete the game and re-enter it. Or if you don't have the Code Manager CD, go into the internet and look up the code for Pokemon Diamond Version, and fix it on your Action Replay.
Remove all the action-replay enabled cheats and try again. If this doesn't solve the problem, the game has been corrupted, although this is highly unlikely because action replay should not be able to do this. If your son still wants to use cheats, have him use one cheat at a time and gradually add more to find out where the limit is where the game breaks.
action replay is not a licensed product for nintendo. so it is going to do that. this is normal. i myself had to go through 2 ARs to get the third one working. either the code is messing it up, or it is time to et a new one.