Metagame balance
I gave the current metagame a score of 6/8. When you take into account the fact that I think it's unrealistic for any tier to get a perfect score, and the fact that BW is a very volatile metagame where building sometimes feels impossible, this score is actually kind of incredible. I really like the current meta and even the few issues I have with it, some of which I'll go into here, aren't that crazy in the grand scheme of things and might not even improve the tier by much if they were to be dealt with.
Volc suspect:
Volcarona is always something I go back and fourth on: sometimes I feel like I want it gone and sometimes I think it's ability to punish most sand structures the way it does is a good thing, and I am not sure if banning it is the right way to go. That being said though, I think it does deserve at least a suspect. It's much more potentially punishing than stuff like Conk, because as threatening as Conk may be, it's rare to lose to it off of just 1 turn going in favor of the Conk user, whereas with Volc, while it's not the norm that some people make it out to be, it's still not that uncommon to lose off of just 1 wrong turn. Also, it's ability to pick and choose it's better matchups with all 3 of: its choice between timid vs modest, 4th moveslot, and especially it's item, isn't super healthy either.
Alakazam suspect:
I think that, a lot of the time Zam is actually a very good pokemon to have in the tier, as it's a very healthy revenge killer, especially with sash, but the breaking power life orb provides it, specifically with focus blast, has made more skeptical about it recently. It mostly just boils down to focus blast + hpice + signal beam/shadow ball hitting everything, and with the extra kick provided by life orb, hit really hard, but having to rely on focus blast makes it so frustrating because sometimes it can act as a reversal that works 70% of the time against some of its most common checks, and that really limits consistent defensive counterplay, and with Zam being the fastest non boosted mon you'll probably see in most BW games, checking it offensively, like all other Zams, isn't exactly easy either. While I'm still on the side of it being more of a blessing than a curse overall, with sash and even life orb hpfire+grass knot being healthy options, I ended up voting unsure because of the sheer destructive potential life orb focus can have.
Cloyster suspect:
I remember how happy I was when Cloy got banned, and while now the meta is a bit better at taking it on, I still don't support a Cloyster re-test whatsoever. I already talked about my mixed feelings on Volc, and to me, Cloyster is all of the bad things about Volc made worse: many different item choices, much MUCH more moveset options than Volc as it can choose to go mixed if it wants to beat some of its usual checks, and the worst part, it's waaay more common for it to win games with a single safe setup turn, and it also has a much easier time getting that free turn, because it can set up on most ground types safely, which there are a lot of. If all of that doesn't convince you: do you really want to free a mon that makes stealing games easier and building even harder with the only benefit being the ability to punish sand hard, when we already have things like Volc and Conk now? I doubt it.
Chlorophyll suspect:
Is chlorophyll broken? If I had to guess, probably not. Sun will always have a problem actually keeping sun up with it's lack of good spinners that fit naturally. However, do I want another strain on teambuilding? Again, probably not. Ultimately I did decide to vote unsure because if chlorophyll sweepers don't prove to be some completely different to handle from the threats running around now, then sure, I won't mind them, but I have no idea if that'll actually end up being the case. I don't think there's too much of a point with testing chlorophyll, as the chloro mons themselves don't provide any positives to the tier that I can think of, again, if the mons are fine, I don't really care
One last mon I want to mention which I think deserves a look is Thundurus-therian. The reason I brought it up isn't because I think it's necessarily broken, but rather because of how unhealthy it can be to answer it. It actually has a some of the unhealthy traits the mons I talked about have: the focus blast reliance of Alakazam, the ability to pick it's better matchups with it's 4th slot like Volc, but neither of them are the real problem, but just a bit of extra icing on the cake. The real issue is it's thunders. A lot of it's common checks, with Latios being the prime example, hate getting paralyzed, and with thunder having a 30% chance of doing so, it means it can punish at least decent play by just rolling numbers in it's favor, and unlike something like Jirachi, it can punish it's supposed counters as they're switching in, it only needs to roll the rng in it's favor once for them to be crippled, and when it does get it, it's not for just one turn, but for the whole game. The only real positives Thundy provides are giving rain teams a good punish into Ferro, and a volt immune to help pivot around Rotom and other Thundurus, and while I do think it's probably rains best option for both of these roles, there are still other mons that can take on those tasks and I'm personally fine with rain being worse if it means Thundy is gone.