Get the aurora ticket.
You can't get all of the forms of deoxs in Pokemon emerald that's what I heard from my freind.You can only get the speed form of deoxs.If this isn't true then I'm very sorry.
No, you cannot. Only if you have an action replay, and have the code to get deoxs. If you get the code go into the grass (in the game) while holding select and you get deoxs.
honestly i don't know!! I'm soo sorry
Deoxys is changed into speed form by trading it to Pokemon emerald or by walking up to a meteorite in veilstone city in Pokemon diamond/pearl and pressing A while it is in your party (first slot).
Without cheat codes you have to get the mystery gift, obtain the Aura Pass, go the Vermilion City and board the ship and use the pass go to the space needle and ride up to space and catch him there and deoxs
In Diamond, Pearl & Platinum you go to Veilstone City and have the Deoxy in you party and each Meteor will change it into it's other forms.in Emerald, etc I'm sory but I don't know.Your's Truly- yehthatisme
In which game?
sorry to say your out of look i got all event Pokemon but that was ages ago the only way you can get him now ist to get rather an action replay of gameshark you can purchase these items from eBay, game stores from revangar
In Meteor cave, you can get there after recruiting Lugia
action replay or transfer machine
go to the safari zone in emerald
Go to youtube.com and watch a walk through about Pokemon emerald