Sorry but it is impossible to do that.
NO ITS NOT
94000130 FFF30000
B2101D40 00000000
2000104A 0000007C
D2000000 00000000
Press Start + Select before entering the room Giratina is at in Turnback Cave.
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You don't need a code just go back during the same timeframe as before(if you didn't catch it.) It'll be there.
There is none moron! Just save before you battle DARKRAI! And get some execise when you are done! Ok there may be a code but I don't know! Get your nerd butt out of that chair and move it outside!
That is actually the code to put platinum into Your AR.
You don't need a code, unless your inside. The only thing you need is the VS. tool in the special pouch! Hope I helped =)!!!
sorry, but there isn't a code to rebattle the gym leaders in diamond or pearl. there was once an attempt but, the leaders couldn't be rechallenged without you receiving the gym badge again. once you have two of the same gym badge the game freezes.