Altaria! It's super cute and fluffy, plus I like that it's a Dragon type and you would never know by just looking at it. You can teach it a lot of crazy moves and have a varying moveset with them, so I never get bored raising them. Altaria is just important to me in general, though. Swablu became the mascot for Challenges while I moderated it, so naturally I was the Altaria. :P