Ninetales was NU in DPP. It is now OU and was 13th in September. This is ALL thanks to Drought. The joke is that Ninetales needs to literally do nothing but switch in and she has instantly supported her entire team and (potentially) crippled the entire enemy team if they were reliant on a different kind of weather. Sun and Rain are the most powerful conditions in BW2. End of discussion. The only support that comes anywhere close is Stealth Rock. Ninetales gives Sun for free for the ENTIRE GAME if you win the weather war or if your opponent just wasn't using weather. Everything else (dealing with Dugtrio, Spikes and Stealth Rocks), pales in comparison to that. If I deal with one Pokemon, I get free +2/+2 boosts for all my sweepers and turn them into the most threatening Pokemon in the game? Sounds like S-tier to me.