No you cannot. Only in Ruby,Sapphire,Firered,leafgreen,Emerald,
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You can't catch Deoxys in soul silver
I would suggest the Global Trade Station. Deoxys is an event pokemon and the event has long since passed
you have to get more then 45 gym to catch legendary Pokemon! deoxys is a legendary Pokemon
If You Want A Deoxys In Pokemon Platinum ,Migrate,Trade,Or Use The Action Replay Pokemon Modifier.
No, as of 2014 there is not a listed cheat to get Deoxys in Pokemon Emerald for Visual Boy Advance. The Deoxys does not evolve into any other type of Pokemon.