You ban the pokemon. None of the moves are broken, nor is the ability, since it requires the combination of them to be broken. Therefore the pokemon must be broken.
Yache SD chomp was broken last gen, but not other sets. We banned chomp, not the set.
You ban the cause of the problem. Are Kingdra, Ludicolo, Kabutops, and 90% of other rain sweepers broken withiut rain? Not even near. Are they broken with rain? Yes.
Therefor, Rain is the cause of these pokemon being broken. If it was only one pokemon who became broken in the Rain, then that single pokemon would be at fault, but Drizzle makes
many pokemon broken.
It's like I said before, Drizzle gets banned, then Dory gets banned, then the metagame will probobly be near stable. Because Dory is the only real broken factor of sand. Landos hardly cares about it, and Garchomp is relying on luck to get any benifit whatsoever.
Oh, and Garchomp wasn't banned just due to Yache SD. Substiture to abuse Sand Veil in Sandstorms, Choice Scarf Outrage cleaning, power bhind the Choice Band set. If all Garchomps were Yache, then Scarfed Dragons would be the answer, no? Or even Latias for the breif period both were in OU during Stage 3.
Also, the best argument I've seen for Drizzle not being Uber is "It's not hard to beat" without any justification. No-one's really given anything that can solidly counter, or even check, rain, that's not going to gimp yourself against every other team out there.
And to those people claiming it doesn't matter how many abusers Rain has, while Sand has just three offensive threats:
More abusers = more flexiable, more unpredictable, and harder to counter. Against Sand, you just have to check Chomp and Landos [Ice types, Froslass/Mamoswine...] and Dory [Roopushin/Azumarill]. Against Rain, you have Manpahy, Kingdra, Kabutops, Ludicolo, Toxicroak, the list goes on. Unlike Sand, where you only have to prepare for physical attacks, rain, you have to prepare for all sorts of things.
And, I find whoever mentioned making a stall team with the 50% Sp.Def boost for Rock types, with Sandstorm, hilarious. With all the new, powerful fighting types everywhere? Craydily dosen't stand a chance. Sand was used on Stall teams in Gen 4 for the residual damage, not for the Sp.Def boost.
A stall team is far more likly to run Hail in Gen 5, due to Abomasnow 'handleing' the two main weathers [Read, being able to switch in on Poli/T-Tar/Hippo], and the chosen weather not only damageing more types, but also being less risky. You don't want to benifit the other team, and Hail is the group with the least pokemon who benifit.
Of course, Stall, in this metagame? You have to be kidding me.
Also:
About drizzletoed i would like to say that i don't think it's broken.it centralizes the metagame to a large degree but not too much to handle.i just think that everyone finds rain so broken 'cause noone is thinking out of the box.everyone tries to win using a mix of their classic ou pokemons and the new ou-to-be pokemons.people need to adapt to the new situation and find ways to deal with the rain without being uncompetitive...here are some pokes that fare very good against rain after some battling i did using them:
-nattorei
you all know him i am not going to say anything.rain's biggest nemesis!
-specially defensive empoleon with rest talk or wish support
counters completely and absolutely the beast named kingdra and does a lot of other stuff like setting up sr,attacking with his very good sp.attck and keeping at bay a lot of stuff with his very good defensive typing.
-toxicroak
i love this guy.i use it on my own rain team and he usually 6-0 wins me matches.my favourite set is adamant max hp and max atc with drain punch,sucker punch,protect and bulk up.he counters kabutops without return,sp.attacking ludicolo(resists every attack of ludicolo except ice beam that can be easily healed with leftovers,dry skin,protect and drain punch)and half of the moveset of kingdra,which are the 3 more common rain sweepers.and he is not nearly useless outside of countering rain.he is one of the best counters to roobushin and zuruzukin(resisting both of their moves),brelloom after something has taken the sleep,and finally almost every water poke.
-birijion
another underrated poke.with a set of max hp and max sp.atc,calm mind,giga drain,hp ice and focus blast he can set up on almost every rain sweeper.he laughs at ludicolo and specially based kingdra after a cm,checks kabutops by resisting both stabs and ohkoing with giga drain and also rapes nattorei...
-gastrodon
yet another very very underrated pokemon.can check a lot of rain sweepers depending on the set...if it is max defence it can counter kabutops,omastar without hp grass,and sometimes kingdra,and if it is specially defensive sometimes kabutops,sometimes kingdra and always omastar and dragonite.and generally he is a very useful bulky water with nice immunities and resistances and good offences.
-blissey
she can wall any specially based rain sweeper as u already know...
-water absorb pokes
they can generally assist in taking powerful water hits and not only.
there are obviously a lot more but they are the ones that i tried...and of course u can always change the weather with your own weather inducer or with a weather move.
are these options for effectivley battling against rain limited?i don't think so...
Nattorei: Can't handle a whole team. Dosen't exactly like Ice Beams, Toxicroak is sometimes found on Rain.
Toxicroak: Firstly, you revealed your bias, you're defending rain, yet you use it. Secondly, it's sometimes found on rain teams, and Toxicroak, ironically, walls Toxicroak.
Birijion: Yes, it's underrated. But it's also weak to Ice, and if you're having to go for Max/Max to get it set up, that's gonna bite you against... more or less any other playstyle? Bear in mind, most Kingdra are physical or mixed. They'll outspeed, and then Outrage. Some might even DD or Sub as you Calm Mind, which will ruin anything Birijion can do.
Gastrodon: Nattorei is almost always on rain teams. NEXT!
Blissey: Kabutops, Kingdra, Manaphy will get to +6 and then kill it. NEXT!
Water Absorb: Ludicolo, Kingdra, Kabutops all carry another powerful STAB. This isn't even a check.
Weather moves: Where are you getting this free turn to switch in, and the ability to take another hit, before setting up? And, Politoad will just switch back in, and you're not gonna switch in twice. This isn't even viable, let alone a check.