Some rises, mostly reflecting balance/bulky offense finally starting to find its footing in this meta:

A → A+:
Garganacl is such a good tool for bulkier teams that it's unreal. Its choice of Tera type allows it to immediately patch up a
lot of matchup holes in a typical balance/bulky offense team — rain matchup looking dubious? Try Tera Water! Struggling with Pults? Give Tera Fairy a shot! People have figured out that Iron Defense + Body Press makes for a solid anti-offense tool that can even win some endgames, but recently (as in, on ladder and in recent rounds of No Johns) we've been seeing Protect and Stealth Rock being ran more. Despite kind of inviting in the best removal in the tier, Garganacl is actually a really good rocker — Salt Cure chip wears down Tusk over time and forces Corvi to Roost a lot more than it'd like to, giving you a lot of opportunities. More importantly, its so damn bulky that it doesn't need to spam Recovers, meaning it actually has a lot of free turns to click Stealth Rock and Salt Cure — a privilege that a lot of other setters don't share right now. This thing can even run Boots if you want. Just so so so good, partners very cleanly with a lot of other balance/bulky offense staples, and is a very good defensive Tera user that allows its team to patch up bad matchups effortlessly. Very few other mons share this luxury. It's also just a mon which never really has a bad matchup — something like Annihilape can struggle vs more offensive builds, often being relegated to a role of "take a single hit and try to hit decently hard back", but Garganacl is an incredible wall vs offense, a great progress-maker vs balance, and can even pressure and wear down stall to some extent (though it does need to be paired with a proper wall/stallbreaker, fortunately a lot of stall's switchins to Garganacl let threats like Chi-Yu in for free, so with Salt Cure and some smart doubles you can really wear down stall over time). It's also just really easy to fit on teams — it has a free item slot so it can run Boots if you lack removal, it can set Rocks if you need it, its Tera type lets it pick a few extra mons to beat, it's really hard to wear down thanks to its item + Recover + its sheer bulk + its status immunity... It's very frequent for me to be building a team and realize "wait, Tera Water Garganacl answers all my team's problems" or something along those lines.

A+ → S-: Okay, this is perhaps a controversial one — a lot of other Pokemon have been nominated to S- (and I don't agree with any of them) — but given the resurgence of balance in the last couple weeks of No Johns, I am very confident that this Pokemon stands out among the rest of A+.
Ting-Lu is
the balance backbone right now. Simply put, balance as a teamstyle would not exist without this thing. It's the best Chi-Yu check that can be put on teams without making significant teambuilding compromises (not that it's 100% reliable, but it's far better than anything else besides Roaring Moon and Ttar), it naturally pairs well with other strong balance Pokemon like Gholdengo and Garganacl, it also has some flexibility with its Tera type, and of course it avoids being setup fodder thanks to Whirlwind. It does have some exploitable flaws — it relies on Leftovers (often paired with Protect) as recovery, meaning that it struggles to justify running Boots, resulting in it being very weak to Spikes and Toxic Spikes — but the reality is that this Pokemon is the only thing holding balance together. Look at some No Johns replays from the past couple weeks. You'll notice a lot of balance teams, but most importantly, nearly
all of them run Ting-Lu. This thing is the Cyclizar of balance, except whereas Cyclizar just offers utility for a specific style of HO, Ting-Lu pairs utility with fantastic walling capabilities and fits on plenty of team structures. It can also be surprisingly disruptive to a lot of screens HO teams thanks to its Dark typing and very annoying Whirlwinds. It does struggle with Hatterene, though (a mon that should definitely also rise but I don't really have anything new to add so I won't include in this post), but I think that Ting-Lu's flaws should not distract you to how core this thing is to almost every single fat team having a remote amount of success right now. Way better than the rest of A+, and probably more solidly S- than Dragapult honestly (though they both deserve it IMO) given its cornerstone position in the metagame. If not for Ting-Lu, balance would be near-extinct; but looking at ladder or No Johns, balance is doing fairly well for itself despite some early-generation doomsaying.
If you don't believe me, please just flip through some No Johns replays and look at how frequently this thing is used, the diversity of Pokemon it's paired with, and how often it puts in work in matches. Yeah, it gets worn down, but it basically always does multiple very useful and important things before that happens. And since a lot of games right now are defined by posturing until you can find a Tera threat that either breaks through your opponent or walls them, getting worn down isn't as much of a killer as it was in previous generations — by the time this thing is getting low, hopefully you've found an opening that you can squeeze your wincon through. This isn't the regen core pivot hell of previous Fairygens where anything that got worn down was super easy to outlast by just making safe pivots (though as it happens, Ting-Lu
does partner up quite well with Regenerator Amoonguss).

B → B+/A-: People have been exploring
Azumarill more thanks to its good defensive typing and the tier's Water resists not being particularly fast or bulky (and some of those that are still kind of struggle with Azu, e.g. Dragapult and Roaring Moon). Choiced Dragons are quite good right now and this dissuades a lot of their shenanigans, and of course its defensive typing resists Chi-Yu. Those are all good traits, but where Azu really shines is in packing a real punch alongside these perks. While its priority getting outsped by every other priority in the tier is unfortunate, Azu fortunately resists most of them. This thing is just a really nice glue right now that a lot of people are slotting in to fill holes on all sorts of teams; it doesn't do any one particular job amazingly (its dreams of being a BD sweeper are mostly stopped cold by Dondozo existing, for example, although hilariously Tera Water Liquidation nearly OHKOs Amoonguss at +6), but it does enough important jobs well enough that it's finding a lot of usage.
And some drops:

A- → B+: This thing is sooo exploitable. Besides melting to physical attackers, we've seen that even against a lot of special mons,
Clodsire only really walls them by a hair's breadth. Now, this isn't much of a problem at first blush — it benefits both from Boots and Lefties, and can't be worn down by poison, so being "worn down over time" isn't much of an issue for Clodsire — but it means Clodsire really, really struggles to click any moves that actually make progress. Clodsire
wants to use Spikes, it really does, but it's forced to Recover super frequently, and when it's not recovering, it's often wanting to click a Toxic or whatever as insurance against threats like Dragonite or Great Tusk (a lot of Pokemon that seek to exploit Clodsire are the types where giving them a single turn results in a
massive loss of progress, whether due to spin/DD/recovery moves/strong STABs/whatever). It just really struggles to do its job of Spiking (or Rocking) consistently, and has no real way to overcome its passivity. Even something as simple as Tera Flying/Air Balloon Nasty Plot Gholdengo hard walls standard EQ/Toxic sets, forcing it to run a niche coverage option like Poison Jab or a Rock move in order to do anything. This thing is still a fine mon, but teams are relying on it less and less in favour of better walls and better hazard setters, and Valiants are running Psychic coverage more and more frequently. Not to mention how hard this thing is to fit on balance teams typing-wise; it stacks so many weaknesses with Ting-Lu, Great Tusk, Iron Treads, and Garganacl that a lot of the teams that want a defensive Poison/Valiant check are going to look towards Amoonguss or Iron Moth long before they consider this exploitable blob of do-nothing. A hazard setter that needs to fight tooth-and-nail for a single Spikes turn, and then invites in the best Spinner in the tier who can erase a dozen turns' worth of hard-fought progress just by clicking Spin, feels really really hard to justify. It's at the point where I kind of want to drop hazards entirely and run 2 attacks + Toxic, but then it becomes so painfully passive and competes for a slot with many better defensive Pokemon. Just super hard to find a non-stall team that actually wants this, and "stall staple + rarely used on off-beat balance builds" isn't good enough to justify an A- slot to me when Blissey sits all the way down in B.

A+ → A: Look,
Kingambit is definitely good, and you're hard-pressed to find a Pokemon that preforms better in endgame situations between Supreme Overlord and Sucker Punch shenanigans. But it's also a Pokemon that we've seen more teams figuring out adaptations to — Tera types that resist Dark, Fighting coverage on Chien-Pao/Gholdengo/Espathra, the rise of Ting-Lu and Tera Water Garganacl, Substitute Espathra, you get the gist. Not to mention that DD Pult is losing usage relative to sets that give Kingambit a harder time, namely Choiced sets and especially Wisp. Combine all that with this thing needing to predict in order to actually win many of the endgames it's supposed to be so good at. Overall, while Kingambit's combination of defensive typing, bulk, and endgame wincon abilities are useful, it does not compare favourably to a lot of other high-ranked Pokemon that can do similar things but don't have the metagame positioned to handle them — Roaring Moon, for example,
also acts as a wincon with a defensive typing that's very useful for handling difficult-to-beat threats (Chi-Yu), but people have found a much harder time adapting to Roaring Moon. Beyond Wisp/Plume Chi-Yu, which doesn't even get past Roaring Moon, counterplay to Moon hasn't really taken off in ladder (Tera Fighting/Fairy Chi-Yu is a
thing but it's far from common). Meanwhile, it seems like almost every Dark-weak threat right now frequently runs a Tera that resists Sucker, or a move that gets around Sucker 50/50s like Trick or Substitute. This thing is splashable and scary and gets a lot of opportunities, but people
realized that it's splashable and scary and therefore began to prep for it, and unlike other top threats, it's actually very easy to prep for if you know what you're doing (just smack on a Dark-resistant Tera type or whatever). Strong Pokemon for sure but hard to justify being up in A+ when the anti-Kingambit measures people are taking are so effective.
Also please don't move

down; yeah it can't Defog easily, but who cares? It's still a key part of a lot of defensive structures, and there are a
lot of strong mons to U-turn into right now that exploit the hell out of Gholdengo. Corviknight + Boots Chi-Yu matches up super well into Gholdengo hazard stack, for example; a lot of those teams lack reliable Chi-Yu switchins, and the ones that do exist mostly get worn down by Overheats and then immediately walled right back by Corviknight.