Deoxys is not available in Pokemon Ruby or Sapphire, in order to get it in your game you have to trade with a person who owns Pokemon FireRed, LeafGreen, Firered or Emerald. The worse part is that you had to have an event to get Deoxys and the event is no longer available however at one point if you had Pokemon Diamond, Pearl, Platinum, HeartGold or Soulsiver then you could've connected to Nintedo's Wi-Fi Connection however as of May 20, 2014 Nintendo had shut down its Wi-Fi services for Nintendo DS games however another option of acquiring Deoxys is by using a cheat device like a GameShark or Action Replay.
just ask the guy launcher in space centre in mossdeep city
You would need the aurora ticket.
by cheating
Sorry But as much as i would love to catch it, you can't catch in Pokemon sapphire :(
There are sadly no special events to catch Deoxys in Sapphire. You HAVE to trade a Deoxys caught in an event from FireRed, LeafGreen, or Emerald.
no you cant find deoxys in sapphire. but u can go to 4shared and download a game called Pokemon sharrowns.in it you can catch most of all legenderies.
If you want deoxys in Pokemon sapphire, you need an action replay, or an game shark. Or trade from an emerald game that been to birth island, and has caught deoxys.
202 (Treecko - Deoxys)
You can't catch arceus, unless your doing a gameshark or hack. But you can catch deoxys, kyogre (in sapphire), groudon (in ruby) rayquaza and the three regis. Also, you can catch jirachi oh, I forgot, deoxys is an event too. i
you can't catch it with out an action replay. i do not know the code.
You can catch Deoxys at Birth Island. However, unlike other legendaries in the game, you can't catch it under normal circumstances. You have to use an Action Replay/Gameshark to be able to access Birth Island and catch Deoxys.
NO!
Cheat to get the aurora ticket then go to birth island to capture deoxys.
Trade it from Fire Red, Leaf Green, or Emerald.
you can ethier catch them or use acheat when you get so far in the game. you catch them. they are kyogre,deoxys,castform,regirock,registeel,and regiice.