Pokémon FireRed and LeafGreen/Birth Island

Birth Island is just a small island surrounded by water. Just an island...with a triangle in the middle. Follow the triangle (shortest path possible, don't run) until it turns bright red. comes down and starts a battle. Deoxys is level 30 and has 4 different forms. Normal (if traded to Ruby & Sapphire), Attack (FireRed), Defense (LeafGreen), and Speed (Emerald). Each of them have different movesets, but have the same type, Psychic. Bring a Dark type, and you can pretty much wall it. After putting a status ailment on it, and then putting it in red health, throw an Ultra Ball/Great Ball/Poke Ball to (hopefully) claim your prize. Congratulations!! You have Pokemon #386!!