The only way to gain access to Birth Island in Pokémon FireRed is by using the Aurora Ticket, which can only be obtained through a Nintendo Event. Along with Navel Rock, Birth Island is one of two islands in Pokémon FireRed version that can only be accessed using Nintendo Event tickets. Legendary Pokémon can be captured on these two islands; Lugia and Ho-Oh are encountered on Navel Rock by passing through two separate paths while the Pokémon Deoxys can be found on Birth Island by solving a puzzle.

Once the player reaches Birth Island, he will see a black triangle and a black area on the plateau. The black triangle that warps to other parts of the island each time the player moves it in a particular direction. Once the puzzle is solved, the earth will shake and the Legendary Pokémon Deoxys will appear.

Deoxys was introduced in the third generation of Pokémon games. It has an attack type just like the one found in FireRed and a defense type in Pokémon LeafGreen. Also called the DNA Pokémon, the FireRed Deoxys has a very high base stat of 600 with 150 Attack, 150 Special Attack, 150 Speed, 50 HP, 50 Defense and 50 Special Defense.