NO!
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There's no way to catch Deoxys in Ruby or Sapphire in the wild unless you use a GameShark or an Action Replay to make it appear in the wild. Deoxys can only be caught via Nintendo events which have since passed. Now it's only available if you know someone who can trade you one.
You can't catch Deoxys in soul silver
Get a Deoxys in Pokemon Emerald, Ruby, Sapphire, Firered, or Leafgreen using the Mystery Gift, and migrate it to your Diamond Version.
first go to mt.pyre and go to the tallest part to the right . By the way you will find chimecho that is rare but not as eevee
no you have to migrate it from either Sapphire or ruby version hope i helped