Birth Island (Japanese: たんじょうのしま Birth Island) is a location near Fortune and Quest Islands in the Sevii Islands. It is present in Pokémon FireRed, LeafGreen, and Emerald. It can only be accessed after downloading the AuroraTicket through Mystery Gift, and traveling there via the Seagallop Ferries' dock in FireRed and LeafGreen, or the S.S. Tidal in Emerald.
Unlike the other Sevii Islands, and like Navel Rock, it is not visible on the Town Map* or PokéNav's map* by default, and will only become visible after visiting the location. It is where Deoxys can be found. The player must solve a strange puzzle, by following a moving rock, until Deoxys appears. If the player doesn't follow the shortest path to the next position of the rock, the rock will move back into its original position, resetting the puzzle.