there isn't one for all of them you have to find the individual code for which ever one you want
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There is no current code yet for rebattling arceus but if you have the Pokemon modifier code just throw away no master balls and you will run into arceus where you can encounter Pokemon
action replay
This is also what im finding but im not sure. I have the code for trainer rebattle but not gym leader rebattle. Well im sure i have seen "Press R to Rebattle Gym Leader"
You Can ONLY Get Celebi In Pokemon Diamond By Using Action Replay.
You can't without an action replay