Time to add my own two cents, I suppose.
Zydog
A -> A-: Absolutely
disagree. Zydog is simultaneously a solid boon to offensive teams and a big pain to them. With Chesnaught falling off the map, actual Thousand Arrows resists are pretty uncommon, especially on offensive teams. Even on balance, unless you're packing a Gligar you're gonna be pressured to bring something in and recover every time this clicks an attack. There are very few games where this doesn't have an impact, even if it's as simple as creating free turns by forcing stuff to recover. At the same time, it provides one of offense's most consistent cleaners, and an emergency check to threats with its suprisingly decent Extreme Speed.
Rhyperior
A- -> B+:
Disagree. I've been using Rindo SD a lot lately, and the ability to have a consistent Salazzle switchin, Normal/Flying resist, and rocker that beats Mandi and Gligar is so valuable for offense. Rindo is also neat for just chewing random Grass moves and retaliating back. I'd honestly rather it rise to A than anything, but I think A- is a fine fit as well.
Feraligatr
S -> A+:
Agree. Highly impactful mon, but it simply doesn't make as much of a splash as the rest of the S ranks rn.
Virizion
B+ -> A-:
Agree. Like others have said, SD Grassium Z blows up balances like nobody's business, is a pain in the ass for stall, and gets plenty of setup opportunities to boot. It also loves that Doublade is kinda dead rn.
Yanmega
A -> A+:
On the fence; while nobody can discount its breaking prowess, as eifo said it is rather hard to support between its lack of defensive value and crippling weakness to SR. That said, hazard clearing is better than ever before, and when things go right for it it absolutely performs as an A+ mon would, but I'm not sure the considerable effort required for it to get there merits an A+ rank.
Toxicroak
B+ -> somewhere lower (I think B- is fair but baby steps.):
Yes, please. I despise this mon. It tries to do 5 different things and only really ever does one to any decent level, and while you'd think Milotic's prevalence would mean it is greatly enabled, the reality is that it can very easily lose to Ice Beam Milotic (good move btw) and even vs non IB variants it has to rely on consistently hitting LO Gunk Shot in order to break it, and using Gunk Shot brings up a whole host of coverage problems where you either can't touch Gligar/Doublade/Nidoqueen, can't hit Steels (is a Fighting that can't touch Steels really worth that much lol), or is deadweight vs anything faster because it drops Sucker and at that point I'd just use Virizion.
Bewear
A- -> B+:
Disagree. Arifeen, Aldo and eifo already covered this. Checks random phys stuff, CB is obnoxious to switch in to, Drain Punch is neat to let it stick around.
Hoopa
B -> B-:
Disagree; not much has changed for it and while having to run Fight Z to bypass Mandibuzz makes its matchup versus offense weaker, it still does the exact same thing it always has otherwise.
Meloetta
B -> B+: Late on this, but
Agree. Honestly not sure why this dropped as it's still scary as hell and I'm also not sure why it didn't rise last update either. Maybe I'm missing something?
Aerodactyl
C+ -> B-: Another late
agree. Also not sure why this hasn't risen yet, Taunt 3 Attacks is a solid revenge killer, trapper, and cleaner for offense all in one slot, and Taunt Roost trades trapping for more reliablly pivoting into Salazzle and Swellow and the ability to annoy the hell out of some defensive mons.
Mega Ampharos
C+ -> B-: 4 Attacks is pretty annoying to face with balance and Volt Switch is a pretty nice boon for a breaker of its nature so I
agree.
Noivern
C+ -> B-:
Agree. Actual resists to this are becoming increasingly uncommon, and Taunt Roost shuts down common balance builds pretty handily while still providing a neat rkiller for mons like Salazzle and Zydog. Specs/LO hit pretty decently hard and are still fast as hell providing for a neat wallbreaker that doubles as a cleaner, smewhat like a special Zydog that can miss.
Now for a few of my own noms:
Moltres
A ->
A+: Much like Yanmega, the recent influx of solid hazard control has only served to make this mon even more excellently viable.
When you hit, Wallbreaking sets have a great combination of longevity, speed, defensive value, and power, and SubTox is still as good as ever at whittling bulky teams with ease. Protip: run 84 SDef instead of Def so you can sub on Cress guaranteed.
Megastoise
A ->
A+: Our best spinner, bar none, and a huge boon to offensive teams. It has power, bulk, and coverage in spades, and 4 attacks variants are quite tough to deal with. Literally the only problem with it is you can't core it with Glalie/Steelix, which would both make for great partners.
Doublade
A- ->
B+: I hate to admit it but slurmz was right. This is just really lame atm, it does very little in your average match due to Milo, Mandibuzz, Moltres, MegaStoise and others that just shut it down being excessively common, and on top of this it doesn't even beat all that much anyways.
Decidueye
B- ->
C+: Mandibuzz.
Mandibuzz
A+ ->
S: Speaking of the devil. This may be a tad bit soon, but if you've touched this tier since it's dropped you have to have seen this fat vulture turkey bird whatever sitting on its big fat ass and walling every fucking thing on the planet and shutting down damn near every rocker and being splashable as all hell and enabling defensive teams to a stupid degree like a Gligar on crack while also taking a big dump on bulky teams itself. I've even lost to NP twice because it flinched me to death. It literally does every single thing you could possibly expect out of it. god i hate this stupid thing so much ugh
Vanilluxe
C ->
C+: (probably deserves B- tbqh): If you've played the suspect ladder at all, chances are you've seen my team, and chances also are you've been Blizzarded to hell and back by this little monster. Icicle Plate Taunt bops balances, especially the ever-common MiloLix cores, with relative ease and has the always neat STAB Ice Shard to contribute in offensive matchups, and Specs hits like a entire freight train with no brakes. It also greatly appreciates everyone using Mandibuzz instead of Umbreon, so it gets even more opportunities to click Blizzard versus your average team. (also helps that ant literally just got the boot as i was typing this lmao)
Escavalier
B ->
B-: Doublade may be falling out of favor, but I'm not sure that keeps this from its continual decline as a situational at best breaker/trapper with CB that barely traps anything cause 90% of things it'd want to Pursuit just ohko it with Fire coverage and barely breaks anything becuase Moltres, MegaLix, Milo, and Gligar all just make its day poor. I suppose you trap Cress, but even that can run HP Fire now and
0 SpA Cresselia Hidden Power Fire vs. 172 HP / 0 SpD Escavalier: 136-160 (41.9 - 49.3%) -- 83.2% chance to 2HKO after Stealth Rock lol. Protect 3 Attacks and ResTalk aren't even worth considering rn imo, they're so underwhelming. to be fair this is like one of the few decent vanilluxe checks but idt that's worth much lol
Xatu
C+ ->
C-: This just sucks now. Doesn't check anything, all the relevant hazard setters just screw it sideways, and to top everything off Mandibuzz exists and is literally just 10000% better. The only merit it has is deterring things from clicking Toxic.
Diancie
C+ ->
B-: Yeah, I know this just dropped, but as EviGaro put it: With people using the hell out of Mandibuzz and Moltres, how can this possibly be /that/ bad? Plus, Doublade is on its last legs, Registeel is six feet under, and Durant is out of here. Pretty much everything is looking up for this little rock-diamond thing.
Jellicent
B- ->
C+: Let's be real, when's the last time you've seen this do anything? Trust me, I want to like it too, as countering Salazzle and being the ultimate balance annoyance at the same time sounds nice, but it doesn't work nearly as well in practice and faces way too heavy competition from other Waters.
In retospect this is more akin to a nickel than two cents but ¯\_(ツ)_/¯. Thanks for reading it all, if you did