I want to talk a bit more about Drizzle + Swift Swim, otherwise known as Aldaron's proposal. Following on from the previous discussion on Excadrill: if neither Drizzle or Swift Swim are broken, then it stands to reason that the pokemon themselves are broken, and that not all of them are broken (worst case being that only one is found not to be broken - though one might conclude that it is just an anomaly and hence decide to ban Swift Swim) or maybe even non-Water-types - Armaldo, Beartic (this might make more sense since it is the same logic used to keep Chlorophyll). If all the abusers were broken then it would imply that SS is broken and it would be better to ban SS rather than all the pokemon with SS. Assuming that this is true, and that Aldaron's proposal is simply a means of saving time (rather than finding the exact list from the 35 - 16 (LC) = 19 SS pokemon), then everything would be fine...
However, this means that Drizzle should not have an effect on pokemon to be suspected. Put another way, Drizzle should not result in any more bans as otherwise it would imply that Drizzle is the problem and not the pokemon. It's simply wrong to say: if Drizzle + X and Drizzle + Y are broken, then ban X + Y (when neither of them are broken without it). If we can find at least one case where this isn't true, then it would mean that Drizzle is indeed broken. Otherwise, we're good : )
Let's go over some Drizzle related bans shall we?
Manaphy - well Manaphy was broken in DP even without Drizzle and Tail Glow being +3 so it's not that much of a stretch to say that it would be broken without rain in BW.
Thundurus - probably broken regardless of rain, right?
Tornadus-T - hmmm, if torn-t isn't broken with drizzle (i.e. is broken regardless), then it would imply that it's a weather independent sweeper (i.e. it would work equally well on both rain and sun teams >_-) - I think Valentine might have used a Hail team with physical torn-t, but even then, without Hurricane...
Torn-t had a ban rate of 71.05%, uber no matter how you cut it. The question is: is it uber without drizzle? If you don't think drizzle is broken, then it shouldn't be possible to say things like 'torn-t is only broken in rain'. If it's broken, then it's because torn-t was broken and not drizzle. If torn-t isn't broken without drizzle, then it would mean that drizzle really is broken after all.
There's really no way to test it, given that drizzle is legal, but it's not really that hard to imagine that torn-t would be ou without drizzle; in fact, some people think it's ou even with drizzle (notable people include Aldaron and Pocket):
http://smogon.com/forums/threads/ou-round-9-suspect-voting.3477463/
http://smogon.com/forums/threads/ou-round-9-suspect-voting.3477463/page-2 (though I think they might have changed their opinion based on a recent ct)
hmmm