Not in the wild; you must trade it from FR/LG/E.
You can obtain Deoxys in Pokemon Diamond by:
Cheating
Trading
Event
there isn't
No
No, you can't catch Deoxys on Pokemon Diamond & Pearl unless you have cheats. You can transfer it from your GBA to Pokemon Diamond and Pearl though
action replay
Migrate from emerrald
No you can't catch deoxys by using cheats
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.
1. Catch it in a Pokémon GBA title with an event and migrate it to Diamond.
there is no spaceship area but if you are wanting to change the form of your Deoxys it is at veilstone city . Just have your Deoxys in your party and click a on them. I hoped this helps if you have or will ever have a Deoxys in Pokemon diamond pearl OR platinum :D
There is NOT a Deoxys fossil. Deoxys is extinct, as there isn't an event in the WORLD that gives him away.
Deoxys doesn't come from a fossil, and can only be found through events from generation 3 games. If you want Deoxys in Diamond, you will have to migrate one through the pal park after you beat the Pokemon league.
What for? I already have one.