I'm usually not for banning but I think that DrizzleToed might be broken:
1) Stats alone, Politoed may look pretty UU but Drizzle boosts it's special attack when using its STAB just by switching in. Given the fact that many Toeds run Choice Specs and have Water Type moves(usually Hydro Pump or Surf) it technically has a triple STAB, which undermines the fact that Max Sp Atk Poliotoed only hits 306. Factor in STAB, Rain Boost, and Specs, it gets kinda ridiculous for a support 'mon:
Hydro Pump (rain) vs. 252/252 Reuniclus: 101.9% - 120.1%
Hydro Pump (rain) vs. 252/216 Scizor: 103.2% - 121.5%
Hydro Pump (rain) vs. 252/4 Blissey: 40.5% - 47.9%
Hydro Pump (rain) vs. 4/0 Garchomp: 120.1% - 141.3%
Keep in mind that's coming from a pokemon with base 90 sp atk. That means that Politoed serves as an example that Rain and a Choice Item are suspect for being overpowered. However, let's not forget that there are other weather starters who get rid of Rain when they switch in. I got these calcs of the Politoed analysis, and Abomasnow wasn't there, bear with me.
Hydro Pump (sun) vs. 0/4 Ninetales: 87.8% - 103.1%
Hydro Pump (sandstorm) vs. 252/252+ Tyranitar: 59.9% - 71.3%
Ninetails can't switch in on Politoed or it gets wrecked unless there aren't any entry hazards. Tyranitar also has to be wary in switching in with entry hazard support, not saying it's a OHKO, but knocking a Tyranitar well under 50% is nothing to scoff at.
I hope that at this point I've established that DrizzleToed is powerful in its own right. However, the best part of Politoed is its support capabilities.
2) DrizzleToed boosts it's teammates offensive prowess to such a degree that it was nerfed. Kingdra, Kabutops, Gorebyss/Huntail, were found so broken with Politoed's nearly effortless support that a restraining order was enacted against them. If that wasn't a big enough warning sign...
3) Politoed is a very diverse supporting pokemon. However, those diverse boosts are done just by switching in. When Politoed switches in:
-About 30 pokemon gain recovery equivalent to or more than leftovers just by Drizzle being set up(Toxicroak being the more than with Dry Skin)
-The power of Fire type moves is halved
-The power of Water type moves is raised by 50% (which by itself equals the power of a Choice Item/STAB on all water type attacks)
-Moonlight/Synthesis/Morning Sun recovery is lowered to 25%.
-Thunder/Hurricane gain perfect accuracy. As if Tornadus, Thundurus, and Dragonite weren't good enough already DrizzleToed makes pokemon powerful across the board:
Dragonite/Tornadus/Thundurus were mentioned above but they get a perfectly accurate, STAB, 120 Base Power attacks coming off Base 100 and 125 Sp. Atk respectively. Gyarados's base 125 attack gets a double STAB Waterfall, Rotom gets STAB Hydro Pump boosted, Steel Types (if they weren't good enough already) essentially lose a weakness making Jirachi, Metagross, Ferrathorn, etc stronger on the special defensive side. Water type sweepers are inherently more powerful and let's not forget CB Azumarill's Aqua Jet (bye, bye Excadrill).
In conclusion, I think Politoed is too powerful for OU not only for its own strength, but for the ability it has to boost the overall effectiveness of its teammates and nerfs its opponents.