You can't. you can only get Ghiritina's origin form in Pokemon Platinum, which is coming soon.
The action replay is a device used for cheating.
you can if you have an action replay
you have to use action replay or to get alot of Pokemon migrate from a firered and use action replay on firered to get all Pokemon except the one from diamond
U HAVE TO MIGRATE OR ACTION REPLAY
use an action replay.
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. ;)