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
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.
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.
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).
Get the aurora ticket.
You can't catch one in Pokemon Emerald.
Yes, You can catch Groudon in Pokemon Emerald.
No you cannot catch Entei in Pokemon Emerald.
You can't catch a Bellsprot in Pokemon Emerald. You trade it from Pokemon Leafgreen!
There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.
Cressilia is a 4th generation Pokemon so you can't catch it in Pokemon Emerald.