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yes you can get arceus on any sinnoh game
Actually. Arceus isn't legitamely obtainable in Pokemon Platinum. Or any 4th generation game for that matter. The coding for the hall of origin and arceus and his pokedex entry and everything is programmed in but the event item to access the Hall of Origin has never been officially distributed so you cannot obtain an Arceus without hacking or tweaking(although tweaking next to impossible).
you can't get origin form in diamond and pearl, but in platinum you can
you beat the elite four
its Giratina's Origin Forme