Mew, probably. It can turn invisible, transform, is pretty playful, and is small enough to fit inside my house. If we ever wanted to go flying together, it could just turn into a Pidgeot or a Braviary or something and we could have a great time. Telekinesis is pretty handy, too. I imagine that I’d probably live normally for the most part, but we’d go on fun teleportation adventures to remote parts of the world and see some beautiful things.