Cuz when you geneticly recreate a pokemon, why not slipe in a few improvements? It is a geneticly altered, mutant Aerodactyl. It has no eye. Ifigured it was a strong attack, but it was fine because, like electivire LV. X it is easily avoidable. But I also get Aerodactyl's attacks so it still has some potential.
Phoenix also represents Rebirth which is sort of what happens when you level him up. He is "reborn."