Non-banned legendaries/ubs/megas/mythicals: Articuno, Regigigas, M-Audino, M-Absol, and Nihilego. Possible threats include: Skarmory. Skarmory is already somewhat viable in OU, and, when compared to other non-evolving Pokemon, is one of the best. Smeargle. Sketch. Enough said. (Possibly)...