Overused: Infernape, Spiritomb, Kingdra, and Metagross
Borderline: Clefable, Poliwrath, Electrode, and Lucario
Underused: Hitmonlee, Qwilfish, ???, and ???
I'd tell you not to add me as I'll probably be editing this, a lot. But you can add me if you don't mind editing at my command.
@Leman: That's how we did do it. :x