If you mean Arceus, you will have to blow the Azure Flute, which you get only by Mysterious Gift or you can use cheats (Action Replay), on the Spear Pillar, found at the top of Mt. Coronet.
Trade from Diamond, Pearl, or Platinum
hall of origin
only with action replay!!! there is no way without action replay
how do you catch a mewtwo on Pokemon platinum
You can't catch Arceus in Pokemon soul silver. You must trade it from another game.
you cannot catch the 3 regi's in Pokemon platinum you have to catch them in Pokemon emerald then transfer them to Pokemon platinum. thnx
You can't actually catch him in Pokemon platinum but you can migrate him over to platinum if you have him in another game
you can't catch him in platinum but in soulsilver or heartgold you can catch him then trade it to platinum.
it is a event so you cant just walk around in mountains looking for it
Yes.You can catch charmander in Pokemon platinum.
vulpix is not in Pokemon platinum version.
You can catch Sinnoh Pokemon in Pokemon platinum, but you need to migrate and trade unless you have an action replay