you go to bith island or trade it on wifi
You can't
On Birth Island.
darkrai will win.because darkrai have abilities to make a Pokemon having a nightmare. dexoys kk
find the code online
You can't without action replay
You can either migrate it from Pokemon Emerald version, get it from trade, cheats, or events. :)
You can find Deoxys in Saffron City where Sabrina is.
After you beat the game, there is a secret mission you can choose from the main menu
No only in wish island
The only way to obtain a Deoxys is to migrate it from Pal Park.
You cannot catch Deoxys in the wild. It'll need to be migrated.
I do not know. LOL ignore me.