Deoxys is a Legendary Pokmon that may be obtained in Pokmon Emerald by finishing the Start Island occasion. To start out the occasion, the participant should have a Jirachi of their get together and communicate to Professor Birch in his lab in Littleroot City. Professor Birch will then give the participant the Previous Sea Map, which can be utilized to sail to Start Island.
As soon as on Start Island, the participant should navigate via a maze and remedy puzzles with a view to attain the summit of the island. On the summit, the participant will battle Deoxys. Deoxys is a strong Pokmon, so you will need to be ready for a tricky battle.