WCOP is coming soon, so I might as well dump my thoughts on what’s rising and what’s losing traction.
Notable Differences

-> S
These two should be with Zama at this point, forming the Big 3 of OU. They fit on all the common archetypes and function as defensive cornerstones of the tier. Teambuilding would be even more of a living hell without these three. Their impact can be seen by examining how the meta has shifted from HO to Spike Stacking BO or Balances. Dnite checks everything with Multiscale while the opponent has to guess one of billion of Dnite’s sets. Even if the opponent has the right counterplay, teams can very much account for the stuff that walls the Dnite set of choice
(ex: running SE Zama or Knock Tusk for DD EQ/Spinner Roost Nite)
Ting-Lu is self-explanatory. Lives everything, sturdy Ghost resist, vomits Spikes. Several specially offensive staples like Raging Bolt, Iron Crown, and Iron Moth have declined in usage, because in this meta, your valuable as a specially offensive threat is determined on whether or not you can consistently break past Ting-Lu. (Darkrai can Wisp and Ice Beam for big dmg/Pult has Wisp + U-Turn to rack up chip/Ghold can NP + Tera Fairy Gleam)
You’re very likely to find a team that has at least one or two, or even three of Zama/Nite/Ting because they complement each other’s short-comings so brilliantly and cover a majority of the meta on their own.

-> S-
Wellspring at this point should rise, not just because its the single most influential wallbreaker in the tier, but its a wallbreaker that can fluctuate into other roles such as a Ground resist, Wake/Prima deterrent, Knock clicker, Encore, and Spiker. Its role in softening Dnite/Corv/Zama/Pecha perfectly enables common partners like Zama, Gambit, and Dnite to go crazy in the lategame. Broken or not, Wellspring is at least top 5 rn.

-> A+
Gliscor feels like such an oddball in the S ranks, because I would argue its at its worst point rn, which is still really good. SD Gliscor isn’t the archetype-shattering demon it once was back when it was suspected. Double hazard removal cores are the hot new trend on Stall, so SD Gliscor’s main wincon (Knock Dozo’s Boots and click Facade til it dies to Spikes chip) is much easier to manage. Balance teams have very much adapted to Gliscor’s antics, with Corv and G-Weez receiving high usage during the Moon suspect, Weavile making a comeback, and Keldeo being a legitimate mon in the SV OU meta rather than just a fringe pick. SD Gliscor is often forced to Tera, leaving it vulnerable to Spikes, which can severely hinder it if Gliscor doesn’t win the game outright. SD Gliscor builds are also very exploitable by strong offensive pressure, since their teams are often meant to fish slower Balances and Stalls.
I find Waterpon to be the more splashable wallbreaker and the one that should be in the S ranks. Vs more aggresive structures, Wellspring can trade with Moth or Rai with Tera Water and has the defensive profile to punish Ting-Lu for setting hazards. SD Gliscor doesn’t have that immediate power. I actually find utility sets to be better and more hair-pulling than SD. Its bulky enough to eat a Cudgel just to Toxic Waterpon which is game-changing for the Balance/Stall teams it fits on.

-> A+
One of the biggest benefactors of the Roaring Moon ban. It’s close to Pecha in terms of bulky Fairy resists. HO is less popular, Balance/BOs are in the forefront, thus putting Gking back on the map. Not only does it enable strong offensive threats like Zama and Wellspring with its pivoting + Future Sight, but it can massively mess with Stall via Psychic Noise. I discussed how the value of special attackers is dependent on their Ting-Lu matchup, and Gking just so happens to sport a decent-to-good MU into most of them. Also Phys Def Gking is secretly goated. Can semi-check Wellspring and 1v1s Tusk.
252 Atk Great Tusk Headlong Rush vs. 248 HP / 252+ Def Slowking-Galar: 330-390 (83.9 - 99.2%) -- guaranteed 2HKO
Insane calcs.

-> A
Corviknight is on-par with the other birds as it checks similar things. It’s more comfortable with swapping into Knock Off, Waterpon, and AoA Zama. Even after Corv’s stellar performance in SPL, Corv continues to show how good it is at soft-checking offensive threats and generating momentum. It obviously hates Ghold, but forcing Ghold to pop its Balloon via U-Turn is huge for Ting-Lu, Tusk, Dnite.
Treads is debatably the 3rd best hazard lead in the tier, but the reason for this take is because the beyblade has found its way on slower structures with its SpD Set. Lacking the raw progress making and Dark resistance of Tusk, Treads more than makes up for that with a better matchup into the two best spinblockers in the format thanks to its immunity to Malignant Chain and better natural SpD. Thus it is more consistent as a Rapid Spin, enabling strong, but SR weak partners like Specs Kyurem, Volcanion, and AV Torn.
After the Roaring Moon ban, Weavile has found itself to be one of the scariest fast Knock spammers in the tier. Between the classic Boots Tera Ghost set, LO 4-attacks on offensive builds, or CB, Weavile is a consistent progress maker and a valuable form of speed control within the tier. The rise of double hazard removal Balances has also made it more doable for the more immediately threatening CB variants to find themselves onto team structures. Also it can swap into Kyurem Freeze Dry once or twice.

-> A
Regardless of whether you think Kyurem is fine or unhealthy for the tier, I don’t think its as splashable as the A+ ranking would suggest. Due to its lack of defensive utility compared to the premier wallbreaker of the tier (Wellspring), and inherent SR weakness, Kyurem is very support reliant. Needing consistent hazard removal and slow pivots to bring it in. Kyurem is also not unpredictable. DD sets, Specs, and Subtect fit on specific structures to the point where its not difficult to scout out the correct set. DD Kyu suffers from consistency issues and being Tera reliant, along with the usual Kyu weaknesses.
I’m a big fan of Lando, but Lando Offenses aren’t in the forefront rn. It could raise back up some day. Lando is one of the best mons at setting and keeping rocks up. G-Weez and Tusk don’t like eating EP. It doesn’t threaten Corv, but taunting the bird and forcing it to eat Helmet + Rock chip on it is huge for lategame scenarios.

-> A-
Geezing single-handedly revived Stall and allowed for more diverse Balance builds to form. Its unblockable Defog on top of its ability to force progress with status + Neutralizing Gas, has made it a fixture on defensive teams. Weezing also benefits from Ting-Lu’s dominance, discouraging the usage of Crown and Moth who’d otherwise easily abuse G-Weez teams.

-> A-
Hot take incoming. I’ve said this before in a previous set of noms, but I’ll give a legit explaination besides “lol 35% winrate”. Ting-Lu is everywhere, and even vs teams lacking it, Raging Bolt has several inherent flaws. Hates Spikes, lacks defensive utility, and is a major Tera hog. Its a shaky Waterpon check since it just clicks Cudgel + U-Turn for 50%, and Zapdos just U-Turns/Volt Switches out. Treads picking up in usage also worsens things for Bolt. Its not all bad for it though. Bolt is a huge threat to the birds and you can never go wrong with strong priority, even if its flawed and stuffed by random Tera Ground mons.

-> B+
A reminder that B+ mons to be are great but not easily splashable as the A tiers. With that said, Moth is overrated asf. It has most of the same issues as Bolt but even worse. Ting-Lu walls it 99% of the time, Gking is another big issue, Dnite is very common, and Speed Booster Moth is so fucking weak.
132 SpA Iron Moth Fiery Dance vs. 252 HP / 24 SpD Tinkaton: 240-284 (64.1 - 75.9%) -- guaranteed 2HKO
what is this shit? lmao
Super weak to hazards too, which hurts its ability to tank priority and its longevity. You gotta throw it out and hope it does something (i.e hope Fiery Dance procs). Moth is still good for role compression on HO, and Specs/Boots can do work on specific structures. Its also one of the better Valiant checks for HO.
Lokix is still goated and rly good, but I don’t see it often anymore. Corv and G-Weez usage is high, HO is less popular, and Moon’s departure also made Lokix’s valuable priority look less shiny.

-> B+

WASHTOM GLAZING INCOMING
I’m the one who convinced
Magcargo that Washtom is a secret opp. Easily the most underrated mon in the tier, and I’m surprised it hasn’t been seen more. Rotom has a positive matchup into several staples of the format. One of the most consistent Dnite checks, period. Beats all the BS DD sets, even the Tera Blast ones. It messes up Ting-Lu with Wisp, Hydro, and Pain Split. Its also not too shabby into Aoa Zama and KG due to Wisp. Hard counters non-CC Tusk too. Compared to Mola, its less deadweight vs Waterpon since it can pivot out or threaten with Wisp. Washtom also has other notable advantages such as its Spikes immunity, letting it rock Helmet or Lefties, a great offensive typing which threatens Molt, Grounds, and Prima for huge damage. All these traits also make it a fantastic pivot since stopping it from spamming Volt Switch is very difficult. You can slap this on a good chunk of Balance/BOs. My favorite pairing is Washtom + Gking + Kyu + Treads.
Volcanion is underrated for more simpler reasons than Washtom. It hits really fucking hard. Water Absorb discourages Wellspring from clicking Cudgel, and conditioning it to not mindlessly spam its best move is huge for BO and Balance. It has a solid defensive profile into Cinderace, Iron Valiant, Moltres, Primarina, and even Keldeo. Volcanion is also fantastic into Nite/Zama/Ting cores, threatening burns on the former two, while the latter gets smoked by Steam Eruption. It even has some set variety which is uncommon for many B tiers. Specs is simple, 2HKOs everything in the tier and Tera Water Steam Eruption is one of the only special attackerd in the tier capable of OHKOing a healthy Ting-Lu. Volcanion ability to discourage rockers like Ting-Lu and solid bulk makes it great at trading in the early game to break teams down to open up late game scenarios for partners like KG, Zama, and Nite. The other, less flashy sets are Boots which can be slapped onto Boots Spam Spike Stack as a Cudgel/Prima switch-in and generally strong breaker, or lead variants on offensive teams that make use of its utility options (Wisp, Roar, Eject Pack Overheat). You could also mess with the EV spreads and go bulky due to Volcanion already being so strong offensively without a boost. I rock 248HP/116 Modest which lives Tusk HLR, letting you trade with it. Steam Eruption is a very consistent and spammable move in the tier due to its high power + its 30% burn chance. In short, Volcanion packs both defensive utility and insane damage output, making it one of the best mons at trading. Shout outs to
volcanionisgood

-> B
More hot takes incoming. On paper Enamorus should be having a field day in this meta, being able to 1v1 Ting-Lu and Ironpress Zama. Scarf Moonblast also rkills several fast threats in the tier, but I can’t help but feel how inconsistent Enam is. Most good SR weak breakers tend to have absurdly spammable STAB moves (Freeze Dry on Kyu/Steam Erup on Volc). Moonblast seems very close to that, but it ends up flopping into Gking/Molt/Corv who are common defensive pieces in OU. Its good into teams’ who’s Fairy resists are the less specially bulky Pecha and Weezing though, but deadweight vs Molt (esp SpD variants). It’s also competing with other frail specially-oriented breakers like Darkrai, and Fairies such as Valiant or Primarina.
I was adamant about dropping Glimmora, but offense is less popular and Tspikes are pretty useless vs most builds. Not to mention it competes with other leads.

-> B
duckular be damned, Ribombee has shown during the WCOP qualifiers to be on par with Araquanid when it comes to setting Webs. Glimmora is less of a factor in the meta, and Ribombee can make a lasting impact in a game with Stun Spore, ruining a potential target….75% of the time.

-> B-
I’m on the Ceru hype train along with
ausma . This mon is shisty. All those Weez/Ting/Corv/Mola builds, Ceru lowkey destroy them with Bitter Blade + CC. Its great on the cheese offense archetypes (Sun/Veil/Webs). BU Taunt Tera Grass is another dangerous set that shuts down Molt Balances. Tera Fairy Blast is kinda fire too Very legit mon rn.

-> B-
Crazy coming from the OKIDOGI NATION guy, but many of the traits that gave Dogi a niche in SV OU prior, are less valuable rn. It still counters Ironpress Zama (which is still a notable feat), but when so many teams have perfectly consistent checks to it, esp Pecha, Dogi has less of a reason to be used. Lacking a Fairy resist and being weak to Ground, Dogi can sometimes make builds feel clunky. BU sets can take a while to get going, while AV can feel inconsistent as a breaker. Corv comfortably eats Knock and doesn’t mind CC. Pecha 1v1s it even after eating a Knock. Awkward mon that can still do cool things in the tier.

-> C+
Strength Sap is a stupid fucking move.

- C
These two deserve a little more credit than they get. H-Arc is a rare Wisp immune physical attacker that can threaten all the birds with SE Head Smash or Flare Blitz. 90 is a nice speed tier for blitzing past base 80s such as Tusk, Samu, and Pecha. Can cripple Tusk on the switch with Wisp, enabling endgame scenarios. Also packs E-Speed for some semi-decent priority, especially with Tera Normal.
Chesnaught’s a Spiker that beats other common Spikers and 1v1s Tusk/Treads while packing Knock to cripple incoming birds and Ghosts that otherwise have a field day with it. Also checks Wellspring nicely (just dodge Play Rough).

-> C
Latias is a bum still trying to re-live the 1 month it was viable. If you lose to this, either the team is trash or you have a skill issue (like I do).

-> C
An unholy fusion of Ting-Lu and Okidogi. Its a Ghost resist not weak to Gholdengo’s Dgleam and checks other threats like Primarina, Valiant, Darkrai, Pult. Poison Touch Knock Off is scary for any team not running Corv or Gliscor. The biggest appeal of Alolan Muk is it hard walls Slowking-G, and with Protect, shuts down FS + Zama shenanigans via Poison/Dark (also hard switches into Pecha). Weak to hazards and hates Gliscor/Corv, but you can cover those weak points and the payoff is worth it.

- D
Coba’s a fringe rocker that checks Weavile/Gambit while switching into non-Focus Miss Rai.
Kilowattrel has a good speed tier, outspeeds Wellspring, Electric/Flying STAB is scary as demonstrated by Zapdos, and punishes Corv really hard for clicking Defog.
Gapdos also punishes Defog and Parting Shot, can run a semi-scary BU set with Thunderous Kick that could even break through Dondozo with defense drops.