there is no option of going onto an action replay, you must first buy an action replay for around £15. it should have the codes for pearl and platinum on it. they are sold in gamestation and online.
I dont know\\\\\\its at the poke mart
Action replay
Action replay is not an Pokémon item that can be obtained in Diamond.
No
Go to neoseekers.com
no you have to get is from an action replay or go to a Pokemon event
action replay
its a cheat
action replay
Action replay.
action replay
action replay
Find an action replay code and program it, that's how you get many masterballs on Pokemon diamond action REPLAY. ;)