You can only get it in pokemon emerald or by trading records with someone who has it!:) !
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you have to get the aurora ticket from a Pokemon event in japan. then you give the ticket to the ferry person and he takes you to Birth island.
on sapphire Deoxys can be caught with an aurora ticket to get the aurora ticket mix your records up inside the Pokemon center and a Pokemon nurse will give you the aurora ticket it will let you sail to birth island birth island has last resort (celebi and mew) birth island has navel rock(ho-oh and lugia) and birth island has mystic cave (latios and latias) and of course birth island has birth island peak (jirachi and Deoxys) another way is bla bla bla bla a Nintendo event ext ext another way is get a gameshark it'll already have the Pokemon games on there and simply look on it press right click what Pokemon you want and click start PS: if your like what does he mean by records go up stairs in the Pokemon center check your stuff and it will say mix records
Birth Island is a secret Island that is the home of Deoxys. You can only get there if you have the Aurora Ticket.
i have beaten the game, and there is no birth island.
The only way to capture the Pokemon Deoxys is to obtain an Aurora Ticket through an official Nintendo event. The ticket allows the player access to Birth Island where Deoxys waits.