No more ultra powerful dragons please. Let's see, Latios, Latias, Rayquaza, Dragonite, and Salamence are incredibly powerful, with Flygon being debatable. I see only one weak dragon in Altaria, but otherwise, they are usually strong.
Do something new and unique, I want a legendary bug. They're always made fun of, always weak with bad stats, and always easy to catch. Something like the Stickbug, Army Any or even better, a Goliath Beetle. Bugs would get respect finally. Psychics and dragons have had too much time in the limelight, IMO.