Swift Swim + Drizzle
Aldaron's proposal has done its job in preventing Drizzle from being banned. However, it is not a viable long-term solution to the issue. 19 fully evolved Pokemon can have the ability Swift Swim, and unlike with Inconsistent, none of them except for three have shown any potential for being broken in this metagame. Most of the others are not competitively viable, but some are, the the ones that are should not be restricted unnecessarily.
However, simply allowing rain to return to the state it was in in Round 2 would be a horrible mistake. As such, I make the following nominations in place of Swift Swim + Drizzle:
Kingdra + Drizzle
Ludicolo + Drizzle
Kabutops + Drizzle
It is clear now that one or more of these three Pokemon is the real issue here, rather than Swift Swim as a whole or Drizzle. To my understanding, if Swift Swim + Drizzle can be banned to address the problem of the top Swift Swim users in rain, then there is no reason that a ban such as Kingdra + Drizzle cannot be made to address the same issue. This is assuming that when the rules state that an Ability + Pokemon combination, it is referring to that ability being used by that Pokemon, not on the team of that Pokemon, as to my knowledge, there has never been a decision regarding the latter. However, if these nominations are rejected, I instead make the following nominations:
Kingdra
Ludicolo
Kabutops
This should be self-explanatory. These three Pokemon dominated Round 2 and resulted in calls both for a Drizzle ban and for a Swift Swim ban, as well as the eventually tested Swift Swim + Drizzle ban. It is these individual Pokemon that is the issue - not the ability, not the weather, and not any other individual Pokemon. If they cannot be banned only in Drizzle conditions, then they should be banned entirely.
On the other hand, if the nominations made for the banning of an individual Pokemon only under Drizzle are accepted, then and only then I make the following nomination:
Manaphy
To be replaced with the following:
Manaphy + Drizzle
Manaphy was the other part of the issue with Drizzle teams in Round 2. Unlike the top Swift Swim users, it was dealt with as an individual Pokemon. However, if it is found that the top Swift Swim users can be dealt with as individual Pokemon, but only under Drizzle, like the ban of Swift Swim + Drizzle, then the same can apply to Manaphy; at the very least, for the sake of testing it. Manaphy's greatest threat was its ability to abuse Hydration + Rest on sweeping sets, and outside of Drizzle, this is horribly impractical - whether it is using the limited rain from another Pokemon and putting a time limit on its bulky sweep, or setting up the rain itself and giving up its last coverage slot after already using Rest and a set-up move. It is impossible to be sure whether or not Manaphy would still be broken like this, but if such a ban would be permitted, it should at least be tested.
Brightpowder / Lax Incense
I nominate these items to be banned under Evasion Clause. Their only purpose is to increase luck through Evasion, something that is inherently undesirable for the metagame, as evidenced by the broad bans of evasion moves already existing under Evasion Clause. Luck is not a bad element of Pokemon, but more luck through Evasion is not something we need, or ever want.
Sand Veil + Sand Stream
Snow Cloak + Snow Warning
I also nominate these two combinations under Evasion Clause. A 20% Evasion boost without any action is a substantial advantage that can easily be abused, and is not something that is desirable in this metagame. This problem could be solved by banning Sand Veil and Snow Cloak entirely, but that would result in the banning or restriction of usage of Garchomp, Cacturne, Sandslash, Glaceon, Froslass, and Beartic from all teams. That would be an undesirable ban, as none of those Pokemon are broken at present. Of those six, the only two viable in OU are Garchomp and Froslass, but the rest have the potential to be viable in lower tiers. Given the near-nonexistence of the moves Sandstorm and Hail in competitive battling, at least on teams designed to make actual use of that weather condition, this limited version of the ban would remove all real potential for a player to get an Evasion boost from these abilities without resulting in a complete ban of the Pokemon themselves from other teams, in any tier. This nomination is only if additional nominations of a combination of a weather inducing ability and a weather abusing ability are accepted. If not, I will not replace this with another nomination.