Solve the puzzle and catch deoxys
get the ticket to birth island and solve the puzzle. You can only get the ticket from a Nintendo event or cheating.
The triangle puzzle is on birth island and only accsessible by teleport code or The Aura ticket, And if you solve the puzzle , you get a chance to get deoxys
Birth Island has Deoxys. There's a puzzle on the island that if you complete it correctly, Deoxys will battle you. Just Google for the answer to the puzzle.
You must obtain Deoxys from Birth Island in Emerald.
Birth island
Birth island.
Faraway island, Birth island and Southern island.
On Birth Island.
You go to birth island
the way to get to birth island is to get the auroua ticket
If you got the Birth Island event then you can get it.