http://www.smogon.com/forums/threads/usm-ou-viability-ranking-thread.3621329/ - OU

http://www.smogon.com/forums/threads/sm-uu-viability-ranking-thread-mark-three.3613279/ - UU

http://www.smogon.com/forums/threads/ru-viability-rankings.3602279/ - RU

http://www.smogon.com/forums/threads/nu-viability-rankings.3607629/ - NU

http://www.smogon.com/forums/threads/sm-pu-viability-rankings.3614892/ - PU