You can't get it in Pokemon leafgreen or fire red.
You can only get it if you have a Wireless Adapter or Cable Link for GBA. Once those are hooked up, go to any Poke'Mart. Go to the questionaire. Type in "Link Together With All". Save you game and you will have the Mystery Gift. You are linked up so you'll be able to access it from there.
I don't think Deoxes is in Soul Silver.
in the moon
go to game stop say can i have deoxes theyll give you one
you cant
Deoxes would win because they showed on pokemon deoxys beated raquaza
Depends on which game
Trade from another game
u have o get it from ranger
You must get this stone in emerald and transfer it with a Pokemon to diamond or pearl. You go to veilstone city and walk up to a meteorite and press A. you first Pokemon has to be holding the deoxes stone.
no. deoxys is the 386th pokemon. in silver there are only 251.
clear game start new game and clear it again
Deoxes