This thing seems a little out of place in A+, in my opinion. This was a surefire S- rank if S- remained, but in my opinion I still think it's the fourth-best thing in OU at the moment (more on the third-best in a moment). It offers a considerable amount of role compression, acts as an anti-Stall win condition with setup sets, has a notable Unaware set that lets it come in clutch occasionally, can function as a Wish passer as needed, has self-sustainability as is, has a vast utility movepool to cripple opposing threats, and, most importantly, is probably the most durable Stealth Rocker in the entire tier.
One of the biggest things going for Clefable right now is definitely the amount of support it doesn't require. On the contrary, Clefable's ability to keep a decent portion of the tier at bay with its good typing, bulk, and access to two forms of reliable recovery whilst being able to constantly and consistently get Stealth Rock up on a huge portion of the metagame allows it to support a wide array of top-tier threats, including and especially Heatran, which appreciates having a moveslot freed up by Clefable's Stealth Rock and even further appreciates being able to run its pick of the litter for its Z-move over Leftovers. I'd argue that two of the biggest things helping Heatran be one of the dominant forces in this metagame are Tapu Bulu and Clefable, and it isn't particularly unreasonable to argue for a Clefable rise to S based on this alongside its numerous other beneficial traits. I'd consider it the worst of the four things that should be in S without a doubt, but being the worst A-student in an Advanced Placement class isn't exactly something to be ashamed of when you're still an A-student.
Tapu Bulu from A to A+: Strongly Agree
Bulu is probably one of the most splashable threats in the current metagame. It has an assortment of extraordinarily powerful sets, ranging from Choice Band to several variations of its Swords Dance sets to Assault Vest to even the uncommon Choice Scarf, and its fantastic typing allows it to switch in on and force out a decent portion of the metagame, including Ash-Greninja among many other things. I've seen like four or five different variations of its Swords Dance sets, ranging from 3 attacks to a Specially Defensive Bulky Sub+SD+Synthesis set to a fast 2-Attacks SD set to an even bulkier 2-Attacks SD set, and those sets can see anything from Grassium Z to Life Orb to Leftovers. In addition, Grassy Terrain is extremely helpful to an assortment of Earthquake-weak attackers, giving them more opportunities to set up, get hits in, or just sponge tons more hits. Toxapex, VERY notably Heatran, Magearna, Kartana, Clefable, and much more adore the extra recovery or the halved Earthquake damage provided by Grassy Terrain, and some of these can even go so far as to exploit its offensive benefits for the team, too. Overall, I'd argue that Tapu Bulu should definitely be in A+ right now, and I'd argue it provides far, far more direct support than any other Tapu does, whilst still packing a serious punch.
Gastrodon from B+ to B: Disagree
The meta is definitely adapting to Gastrodon's presence somewhat, but a lot of the things Gastrodon used to hard-check or hard-counter that are now trying to adapt to Gastrodon's presence are still being forced to either rely on rather inconsistent solutions (such as a flinch from Ash-Greninja) or are running Grass-type coverage solely to cover their Gastrodon weakness. I feel that we should wait a little bit longer, for some more tournament results, before we truly decide to drop Gastrodon, since the opportunity cost of covering it may prove a little bit too high in other matchups and Gastrodon may end up bouncing back. That said, I do think Toxapex is superior in quite a few cases.
Mega Latios and Mega Alakazam from A- and A, respectively, to A+: Very Strongly Agree
Mega Latios has been talked about to death so far, but there's a very, very good reason why: it's downright phenomenal at what it does. It's one of the tier's few true mixed attackers and it is fantastic at that role, taking down many of the most dangerous threats in the entire tier with Ice Beam+Earthquake+Psychic and having a great deal of staying power by virtue of Recover. Similarly, Mega Alakazam has all but solidified itself as one of the most threatening special attackers in the tier, with Trace giving it a tremendous amount of utility such as checking Heatran and Mega Latios. However, I wholeheartedly agree with the previously-mentioned sentiment of ranking these two in the same subrank. Mega Latios has consistently proven itself as the best Mega in the tier, while Mega Alakazam has gotten so good so quickly that it should be more than free to jump a couple subranks at once. Both should be in A+, and if Mega Alakazam doesn't jump right to A+ I still think Mega Latios should be in A+ without a doubt.
Snorlax from Unranked to Ranked: All. Of. My. Yes.
Snorlax can beat a huge amount of teams right from Team Preview. It requires a decent amount of support to function, but it brings something extremely unique to the table, as almost nothing else in the tier can function as half the Curse sweeper that Lax is. I was initially skeptical of vso's nomination, but after testing out his/her Mega Latias variation of that team I can confidently say that I am really impressed with Snorlax's results. This thing can start boosting wars with even top-tier threats like Zygarde and can potentially come out on top. Its Breakneck Blitz is a headache to switch in on, muscling past even incredibly bulky stuff. It can tear powerful cores in half quite easily, and doing so can force your opponent to be one team member down and staring a boosted lard-ass in the face, and it'll often just win outright. The only thing I'd argue is holding it back in terms of metagame trends is things like All-Out Pummeling Protean Greninja and especially Mega Medicham, who can quite easily tear Lax down even if it has a couple Curse boosts under its belt. But trying to stop it with Taunt isn't a particularly viable option when even without boosts it can 2HKO or even OHKO most Taunt users anyway.
I'd argue that Snorlax should be placed in C+, and maaaaaybe B- at best. I'd say that on paper it's easily more effective than the likes of Mega Manectric, Mega Garchomp, Hydreigon, vanilla Alakazam, Uxie, Avalugg, Mega Altaria, Skarmory, and Mimikyu, and I'd argue that, due to how easily it can fit onto quite a few different archetypes, it's better than half of B- in practice because it doesn't actually require that much support to function. It's actually really, really good, and although its awful matchup against Mega Medicham hurts quite a bit I'd still say it should have a pretty respectable spot on the VR.
Celesteela from A to A+: On the Fence, But Slightly Agree
Celesteela is a bit of a mixed bag, in my opinion: while it definitely fares extremely well against Mega Alakazam and Mega Latios, who are hard-pressed to deal with it alone, Mega Zam's rise in popularity has also resulted in it being paired with Celesteela's biggest headache, Magnezone. In fact, while quite a few trends, such as the rise of Tapu Bulu, Clefable, Mega Lati@s, and Mega Alakazam have been quite beneficial for Celesteela, the massive surge in Heatran usage in tandem with the fact that Magnezone also benefits from quite a few of these trends lead me to believe that Celesteela might not be fully cut out for A+. That said, it's definitely in a better spot now than it was before.
Mega Manectric from C+ to C, C-, or even Unranked: Agree
While I'd like to avoid talking about Zeraora too much at the risk of getting this essay deleted, I'm going to say this much: Zeraora is way, way better than Mega Manectric. Better bulk, faster, harder-hitting, and, most importantly, versatile enough to be a mixed or physical threat instead of basically a worse Koko with Intimidate. This thing requires so much support to function and it's even more heavily outclassed by better Electrics, and it has a higher opportunity cost than Koko or Zeraora. Send this thing to the grave.