Volcarona: I'm kind of mixed on whether I'd ban the thing or not, because I think of how some of the most prominent threats in the tier in Ferrothorn, Latios and Reuniclus end up benefitting massively from having this moth out of the picture. At the same time, there is such an annoyingly restrictive condition to teambuilding while the moth wanders around the tier, forcing some measures like max max Tyranitar in order for it not to go out of control, and hell, sometimes it's not enough even.
In the current landscape, Volcarona has been sort of nerfed, because what made it so threatening also was the uncertainty of its set: whether it had an HP Ice or Ground, Psychic lying around. There used to be, in fact, a saying that states that the right Volcarona set can sweep any team. Nowadays, Volcarona mostly runs the same Life Orb set on the same Weatherless HO structures you see in every tournament, but it's undeniable that it still is a force to be reckoned with.
Like, analyzing many of the Mastermind match-ups where Volc runs the same LO set, you can see it doesn't get much room to shine because teams are well prepared for that variant, so it's rare to see a matchup where it will outright sweep:
Some matches I picked at random where it fights multiple matchups and it does absolutely nothing during the match because the team is either well prepared against it or doesn't have enough fire power to tear through it.
https://replay.pokemonshowdown.com/smogtours-gen5ou-988458 - Never comes out and it practically can't because opp team has Terrak Ttar
https://replay.pokemonshowdown.com/gen5ou-2700182502-e5u9nh1ii67ratpfd792ahexj0i7rcspw - This one is super funny because Chomp comes in on the QD, sets SR, Dragonite switches in and nonchalantly picks up the kill lol
https://replay.pokemonshowdown.com/gen5ou-2711035538-h1lsrh4ds6pijlp1oh6db6btvplaub6pw - No Life Orb, running a regular set, can't bypass rain.
https://replay.pokemonshowdown.com/smogtours-gen5ou-989071 - Heatran Dnite Cockblock
Then some matches where it actually shines:
https://replay.pokemonshowdown.com/smogtours-gen5ou-988640 - Ttar would've been a fine stop to it but one crit was all it took for this match to go south and Volc sweeps.
https://replay.pokemonshowdown.com/smogtours-gen5ou-982267 - Doesn't click Quiver Dance but as you can see against some teams all you need to do is click its stabs and they're toast.
https://replay.pokemonshowdown.com/smogtours-gen5ou-981294 - Team that isn't well prepared against Volc and one lost 5050 spells the end
https://replay.pokemonshowdown.com/smogtours-gen5ou-990373?p2 - A case where the RIGHT Volcarona set tears through a team that should theoretically not have many issues against it
https://replay.pokemonshowdown.com/smogtours-gen5ou-990597 - Another team that isn't solidly equipped against Volcarona and pays the price
So, my current assessment of Volcarona is that some teams require direct measures in order to take care of it (Sand needing SPDef Ttar), whereas some others can naturally deal with the moth (Weatherless has Dnite, Chomp, Heatran; Rain has Tentacruel, Scarf Keld/Lati), but it's also a reality that Volcarona can simply choose to tweak its moveset a bit in order to bypass some of those threats. Not only that, I think, very different to Latios, one unlucky turn can also lead to a loss against it.
Now, If I am fully biased, do I like Volcarona in the tier? No, but not really because of its brokeness. I think the SR weakness and the difficulty of fitting it into teams is what's keeping it afloat in the OU boat, but that's also a side of it that annoys me the hell out. This is a mon that can hardly fit into teams but you ALWAYS need to make sure to have any sort of countermeasure to it like a wild animal preying on you but not doing anything actually. I would, on that basis, support a suspect on it (given the council won't suspect Quiver Dance instead) and choose whether or not to ban it based on the community's thoughts.
Alakazam: More of a staple in the tier and to be honest what does push this little guy into suspect territory is its LO set, which has promoted the use of unorthodox sets in, once again, Max Max Tyranitar with Custap Berry in order to stop it.
This is also a mon I'm pretty much on the fence about because I see why someone would like to suspect and ban Alakazam. I see the elements that push it over the edge but I also see how dangerous it would be for the tier to lose one of its most efficient revenge killers. I'd be scared to see what mons like Dragonite and Conkeldurr would become without Alakazam around.
I'd support a suspect in order to push conversation around this pokemon, but I'd likely vote no ban on this!
Cloyser: No lol keep that mf locked up. Unless they decided to ban Shell Smash, I wouldn't entretain the idea much.
NOW onto what I'd like to propose. I didn't include this in my survey because I thought of it much later, but given the unique properties of BW OU, why don't we introduce a...
WEATHER ABILITY BAN LIST
BW OU is the ONLY OU tier that allows permanent weather + speed boosting ability, and also the only tier, alongside ubers that has all four weathers, given lower tiers have them banned. So, given that unique property of BW OU, why don't we simply make it so some pokemon can be allowed to wield their weather ability and some can't. I think this would solve the big issue with some of these threats in Alakazam and Volcarona because we would get more apt revenge killers against them.
What pokémon could be banned from using their weather abilities in the tier?
PD: This tier can be obviously modified, but I hope you get my idea
Chlorophyll: :venusaur: :victreebel: :exeggutor: :tangrowth: :shiftry: :lilligant: - I think the criteria for sun should be to allow mons that don't have that much access to strong boost moves + a varied movepool. The mons I picked here are all mostly special attackers with access to growth and have hidden power viability which is probably a tad broken in OU. For isntance, a pokemon like Sawsbuck would likely not be broken in OU even with chlorophyll.
Swift Swim: :kingdra: :kabutops: :omastar: :ludicolo: :gorebyss: :huntail: :seismitoad: - The issue with rain is mostly the fact that it's pretty braindead for it to have the swift swimmers just click stab moves mindlessly. The list I made here mostly contains pokemon that have access to a strong movepool and broken moves like Shell Smash. An example I can give of a mon that wouldn't be broken with Swift Swim could be Qwilfish
Sand Rush: :excadrill: - Probably the only broken pokemon with this ability. Nobody had issues with Sandslash or Stoutland.
I think it's high time we stop sticking to Aldaron's old complex ban and actually work in bringing as much variance into the tier as possible. If the weather + weather boosting ability complex ban exists is because of the inherent nature of BW OU for that combination to be broken, so we should make the most of that particular feature in the tier to work on a clause like this that is unique to it.
I agree that tiering something like this would take plenty of effort from the council and a lot of testing, which is hardly possible given BW OU is an old gen and mostly sees play in tournament, but if given the chance, I'd love to collaborate in bringing about this clause.