no
It is rather unfortunate that you can not get Deoxys in Emerald, however, it is possible if you go to a Nintendo Event.
Without cheating? You don't.
No, not without cheating.
a bunch
i think you have to trade them from other games
you carnt without cheating our hacking/codes
You can't...without cheating.
beat the battle frontier!
you can't
trade from other games
no
You can't obtain one in Emerald without trading, attending a Nintendo event or cheating. ...Also, it's named Ho-Oh.