honestly i don't know!! I'm soo sorry
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.
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).
Get the aurora ticket.
In which game?
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.
action replay or transfer machine
In Meteor cave, you can get there after recruiting Lugia
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
The only way to get deoxs is to use action replay or get it from Pokemon sadphire or ruby
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
you can't! you really need to migrate Deoxys or trade him from an other Pokemon diamond/pearl player that has it of course
Of course you can. Just get 2 DSes to trade, or migrate from whatever GBA game you have Deoxs on.