you can't
mystery gift
You can't.
you can get deoxys at birth island
Get a Deoxys in Pokemon Emerald, Ruby, Sapphire, Firered, or Leafgreen using the Mystery Gift, and migrate it to your Diamond Version.
Deoxys
you have to get it in a event and you cant get it in Pokemon leafgreen or firered
Bleddy fool you cantcatch deoxys in fire red
There is no other way, unless you were to trade.
You don't get a Shiny Deoxys from a man. You'll need to get Deoxys in Pokemon FireRed, LeafGreen, or Emerald. It is extremely hard to get a Shiny Deoxys.
Deoxys is a legendary Pokemon which has various different forms. To find one in FireRed version, you need to have an Aurora Ticket.
You need to migrate it from FireRed, LeafGreen, or Emerald. But if you have a Deoxys in Pokemon Ruby or Sapphire, then you can migrate from them to Pal Park.
Ho-oh, Lugia, Deoxys.