you must have an AURORATICKET. to get one, you have to go to an Nintendo event or you must have an action replay. you must go to the sailor in vermillion city and talk to him. he will say "you have a ticket to go to a rare place" and the option birth island should come up.
you will get to birth island, but you will have to solve a puzzle to see DEOXYS. there is a little triangle statue in the middle of the island, a tree at the top of the island and the island is shaped like a triangle. to solve the puzzle, go up to the triangle and press A. the statue will move. keep pressing A at the statue and it will start to turn red, but if you press A at the wrong cornor of the triangle, it will go back to its starting point. if you complete the puzzle, the tree at the top of the island will turn into deoxys.
cheat
On Birth Island
its on birth island
you can get deoxys at birth island
You must get a ticket from a Nintendo Event to go to Birth Island.
Pokemon Emerald: Birth Island Pokemon Sapphire: Trade from Pokemon FireRed, LeafGreen, or Emerald. Pokemon Ruby: Trade from Pokemon FireRed, LeafGreen, or Emerald.
you don't only in Pokemon emerald firered and leaf green
Get an Action Replay and get the Aurora Ticket and go to Birth Island.
you need to migrate from emerald or firered/leafgreen where you can get him from birth island
Birth Island, but you will have needed to get the Pass to get there first which is an expired event.
Hacking/Cheating or legit pokemon event that will give you the ticket to go to birth island
its on birth island and you need an aurora ticket. you get in the mystery gift's Nintendo event
No, not unless u cheat.