Some thoughts:
S --> A+: Strongly Disagree
No.
A --> A+ or S: Strongly Agree (VERY MUCH leaning towards S)
Dragapult has very quickly reestablished itself as one of the tier's premiere forms of speed control and both its Specs and its HDB Pivot sets are among the tier's most difficult-to-check threats, period. It can easily disrupt a team with status and its incredible STAB Hex, it's borderline-impossible to outpace, and its Specs set is borderline-impossible to switch in against. Pult is almost drawback-free to run (it's not flawless, though) simply because it almost always does
something every single game. It's just too good to
not deserve a rise, and I'd honestly go so far as to argue it should be in S.
A+ --> S: Strongly Agree
Torn-T doesn't appreciate the trending Weavile, and the still-amazing Koko, Zeraora, and Zapdos, but I think it's just too good as a breaker to not rise. Torn-T is easily one of the most centralizing forces in the tier (though not quite as much as Landorus-T in that regard) and it serves as a valuable offensive check against many of the tier's biggest threats, many of which themselves are on the rise. It always puts in work with Knock Off, it's always hard to KO because of Regenerator and its decent bulk, and it can turn most Hurricane switchins into free momentum with U-Turn if it so desires on a more utility-centric set. It's just an all-around fantastic mon with very little opportunity cost because of how it differentiates itself from similar breakers and similar Defoggers.
A+ --> S: Unsure
I have a much more liberal definition of an S-rank threat than what is generally used on the VR and I'd personally consider all five of Dragapult, Garchomp, Heatran, Torn-T, and Lando-T S-rank threats. But given the current criteria for being an S-rank mon I'm not sure if Heatran deserves that title any more than Garchomp does, and Garchomp itself is a bit more contentious as an S-rank threat among many players. I do still think Pult and Torn-T are S-rank threats though, but I'm on the fence with this mon.
A --> A+ and
A --> A-: Strongly Agree
There's always going to be a Slow-twin this high up, and with recent metagame trends I believe Slowking has solidified itself as the better Slow-twin for now and one of the best mons in the entire metagame. Slowbro isn't
bad, of course, but I think it should drop a subrank since it just isn't as good as the King right now.
A --> A+: Strongly Agree
Rillaboom hasn't been this amazing since DLC1, but it is truly back with a vengeance. Both Swords Dance and Choice Band have solidified themselves as incredibly solid offensive forces in this metagame after Rillaboom's excellent performance in Week 9 of SPL (it was used six times and had a 100% winrate and put in crucial work in several games either by virtue of its own offensive pressure or
by providing threats with the Grassy Terrain recovery they needed to survive crucial attacks. Rillaboom is an offensive mon, through-and-through, but it offers teams it fits on too much and is too excellent at what it does to
not be an A+ rank threat. There's a good reason why so many players are quite quick to consider it a top 10 threat currently.
B --> A-: Strongly Agree
I won't say much more at the risk of being redundant considering how many players have already talked to death about Weavile's relative excellence in this metagame, so all I'll say is that it is quickly becoming a fantastic mon and is far and away the best UUBL mon in the tier (though come next month it won't be UUBL anymore since it certainly has the usage to become a proper OU mon). It appreciates Torn-T, Garchomp, and Lando-T being top-tier threats and can deal with Dragapult nicely as well.
A- --> Higher: Agree (probably A?)
Zeraora is one of the best pivots in the meta and is one of a very tiny list of threats that naturally outpaces Dragapult, which it can KO with Knock Off quite easily once it's weakened. In a metagame dominated by a handful of phenomenal Ground-types this thing still finds plenty of room to throw around its excellent attacks, pivot around, and Toxic those Ground-types and thus cripple them long-term. Zeraora may be one of UU's best right now but it's pretty damn close to becoming one of OU's best (albeit not as high up on that list whatsoever) as well, and I think a rise is warranted as a result.
A- --> A: Strongly Agree
Amazing breaker. Specs is hard to switch in against and Twisted Spoon is another great set that can bluff Specs but flex Lele's amazing coverage a bit better. Specs is honestly such a good breaker right now that I firmly believe it deserves a rise.

A- --> B+: Strongly Disagree
No, no, no. This thing absolutely doesn't deserve to drop. Yes, its usage and splashability aren't what they used to be in the Magearna meta, but it's still a great, not-so-passive check to a ton of special attackers and it's a lot more free to flex its incredible movepool to blank specific threats with its AV set. I also think NP and Calm Mind (specifically NP) are unbelievably strong against defensive teams, but y'all aren't ready for that conversation yet.
B+ --> A- or even A: Strongly Agree
Another mon that has been seeing a ton of success in SPL lately, boasting a high 26% usage and a solid 60% winrate in Week 9. It's a premiere Rillaboom check with a great defensive typing for this metagame and it's an offensive powerhouse as well. Scizor is pretty quickly catching on as a legitimate OU threat and it should rise as a result of its tournament success.
B+ --> A-: Disagree
I don't believe Tangrowth is actually bad, but I don't think it's good enough in this metagame to be compared to stuff in the A-ranks and IMO it could probably even drop. It
hates Torn and Tran usage being so high although neither can switch in against it and it doesn't appreciate being bricked so hard by Kyurem either.
B --> B+ or even A-: Agree
The Meta Moth once again benefits from some recent metagame trends and is an offensive behemoth that is pretty tough to take down all the same. I think it most certainly deserves a rise but I think even a jump to A- is reasonable enough considering how good it is nowadays.
B- --> B: Agree
Excellent mon that gives specific HO teams a lot of defensive utility by virtue of its good defensive typing while being an absolute bee-with-an-itch to switch in against. Defiant existing is great considering Lando-T's dominance right now, too.
B --> B+: Strongly Agree
Magnezone may be a shadow of its former self, but it's still fantastic at trapping a select few threats that give excellent mons like Rillaboom a hell of a lot of issues. If these threats are to rise--and they are, I would argue--then Magnezone should rise a bit as well due to its ability to support these threats unlike anything else.
B- --> B+: Agree
It's been seeing a decent amount of success in SPL lately and it appreciates plenty of metagame trends. It's not as good a breaker as its banned Single-Strike forme, but it's still an excellent mon right now that has more than established itself as a threat that isn't confined to niche playstyles like Rain.
B- --> C: Strongly Agree
Honestly, I wouldn't be opposed to this shitmon being dropped to C- or even unranked altogether. I think this mon is utter trash as a Screens setter and that Grimmsnarl and Koko are much, much better in this role. I like messing around with Specs on the ladder with some Ground-type lures like Shuca+Ice Beam Glowking, but this isn't even me
trying to pretend that offensive Regieleki isn't a piece of shit that shouldn't be used on a serious team.
B- --> C+: Agree
Ehh... I don't think it's very good, honestly. It's a hell of a threat under the right conditions but it's generally not good outside of specific types of HO teams and is still a massive matchup-fishing mon on those HOs and can be complete dead weight quite frequently. I think anything lower than C+ is a bit of a stretch though.