you need 2 DS Systems. You need to trade the Pokemon from one game to the other using wireless connection.
Chat with our AI personalities
shroomish!!!!!!!! you have to migrate to get on diamond, pearl and platinum
you need to migrate it from Pokemon diamond/pearl/platinum. it is unobtainable in soul silver/heart gold trade, not migrate
Im sorry you can't duplicate Pokemon in Pokemon platinum. You can duplicate Pokemon in diamond/Pearl or emerald the trade or migrate them to platinum though.
Get a Deoxys in Pokemon Emerald, Ruby, Sapphire, Firered, or Leafgreen using the Mystery Gift, and migrate it to your Diamond Version.
The only way I know of is to capture one on a gba game migrate it to diamond or pearl and then trade it to platinum. Sorry if you don't have the gba games or diamond or pearl.