Before I get into my own takes, I guess I'll just make the observation I really don't think there's that much separating the S and A+ ranks, and I think there's a lot of space between the B+ and A- ranks. S, S- and A+ are mostly "things that just ruin you if you aren't prepared or if you don't keep the right things healthy". Below that, A and A- are mostly "glue mons that give you a prayer against the broken shit". Gholdengo is kind of unique, but the other exceptions to that pattern are Tusk and Ting-Lu in S- and A+. For those specific Pokemon, I think their rankings only make sense if you think Ting-Lu is a better bulky, somewhat passive utility mon than Corv, Dondozo, Clodsire, Garganacl, Skeledirge, Amoongus and Treads, and if Tusk is either significantly better than any of them in that kind of glue role or if its offensive uses push it higher than them. I don't really know myself, but they're the exceptions to this tier list where most things with a similar role are near each other. (I think you can also reasonably argue that Cyclizar, Glimmora and Grimmsnarl basically all fit the same mold of "enabling broken shit on HO", but I'm more willing to buy that Cyclizar is better than the others). What I do feel comfortable saying, though, is that for any of these Pokemon to be higher than A, you need to buy that they're better than the rest.
I thiiink that covers the Garganacl and Tusk noms I saw earlier, but I do have one more I have thoughts about:
Quaquaval to A-: Probably? I do really like that it's one of the only good Water types that don't need rain support, because being able to scare the Donphans, Unaware Clodsire, Skeledirge and Garganacl is really good for fighting the meta's fat teams. Plus, being a sweeper that isn't scared of Kingambit or Chien Pao's priority is pretty nice too. Basically, Water types are good and there aren't many good offensive Water types atm. It does not like all the Dragons in the meta that make Choice sets very prediction-reliant, but Ice Spinner is a real threat once you have either a Bulk Up or a speed boost, so yeah, this thing forces you to be very careful if you don't have a Dondozo. As far as the set-up sweepers in the B+ range, it's worse than Volcarona for me, better than Baxcalibur, probably similar to Iron Moth? So yeah, even though I always use Dragonite or Pult, which skews my perspective because they make its life very difficult, I'll buy A+.
As for my own:
Sandy Shocks to C. To be honest, this might be too low, I don't know. But right now, the entire D tier is full of junk and just having an actual use should probably put it up a tier. That actual use is the fact that with a +1 SpA boost, only Ting-Lu is both good on its own and fine with switching into either STAB. It can deal with all the other fat things in the tier (Corv, Dondozo, Clodsire, Skeledirge, Treads), and in particular, being a Booster Energy attacker that can smash all of the Unaware mons is really good. Alternatively, base 101 speed is fine for a Specs user, and Specs Volt Switch is pretty good when the opponent doesn't have Ting-Lu. Is it great? No, but like, it has a clear use that doesn't require a ton of team support, which is better than Brute Bonnet, Cetitan, Haxorus, Kilowattrel, Maushold.
Garchomp to B+. Its defensive sets are way worse than they used to be because they can't run Toxic, and its offensive sets are worse now because it doesn't get Scale Shot, and there's really no reason to use it as an offensive Dragon over Roaring Moon, Dragonite or Dragapult, and if you want an offensive Ground type, Tusk is better. I really only see it used as a Rocks lead that can actually handle the Donphans, which is fine, but I just don't think that's good enough.
Volcarona to A. The reason I'm not nominating this to A+ is because I think it really does need to be an active Tera threat every time you use it, and that's a lot of opportunity cost. With that said, base PhysDef Volcarona has really nice use as a pivot because of its reliable recovery, and ability to counter Valiant, check Tusk, Chien Pao, and Ape, and heal and fish for burns against Roaring Moon, Dragonite and Kingambit. With Tera Fairy, you smash all of the above, and also turn into a 6-0 machine because Fire-Fairy coverage is really good and reliable recovery means that getting multiple Quiver Dance boosts is very realistic. Sure, Ting-Lu, Clodsire and especially Skeledirge can stop you, but I can't tell you how many times I just win on team preview against teams that don't have one of them because Tera Fairy means you resist Sucker Punch, and DD Dragonite can't win the 1v1 against a boosted Volcarona. At the very least though, I would definitely argue that nothing else below A+ is as capable of ripping through teams, and it's better than Iron Moth, the only other offensive Pokemon in A- and A, because Quiver Dance gives it a combination of power, speed and bulk that Moth can't reach.
I thiiink that covers the Garganacl and Tusk noms I saw earlier, but I do have one more I have thoughts about:
Quaquaval to A-: Probably? I do really like that it's one of the only good Water types that don't need rain support, because being able to scare the Donphans, Unaware Clodsire, Skeledirge and Garganacl is really good for fighting the meta's fat teams. Plus, being a sweeper that isn't scared of Kingambit or Chien Pao's priority is pretty nice too. Basically, Water types are good and there aren't many good offensive Water types atm. It does not like all the Dragons in the meta that make Choice sets very prediction-reliant, but Ice Spinner is a real threat once you have either a Bulk Up or a speed boost, so yeah, this thing forces you to be very careful if you don't have a Dondozo. As far as the set-up sweepers in the B+ range, it's worse than Volcarona for me, better than Baxcalibur, probably similar to Iron Moth? So yeah, even though I always use Dragonite or Pult, which skews my perspective because they make its life very difficult, I'll buy A+.
As for my own:
Sandy Shocks to C. To be honest, this might be too low, I don't know. But right now, the entire D tier is full of junk and just having an actual use should probably put it up a tier. That actual use is the fact that with a +1 SpA boost, only Ting-Lu is both good on its own and fine with switching into either STAB. It can deal with all the other fat things in the tier (Corv, Dondozo, Clodsire, Skeledirge, Treads), and in particular, being a Booster Energy attacker that can smash all of the Unaware mons is really good. Alternatively, base 101 speed is fine for a Specs user, and Specs Volt Switch is pretty good when the opponent doesn't have Ting-Lu. Is it great? No, but like, it has a clear use that doesn't require a ton of team support, which is better than Brute Bonnet, Cetitan, Haxorus, Kilowattrel, Maushold.
Garchomp to B+. Its defensive sets are way worse than they used to be because they can't run Toxic, and its offensive sets are worse now because it doesn't get Scale Shot, and there's really no reason to use it as an offensive Dragon over Roaring Moon, Dragonite or Dragapult, and if you want an offensive Ground type, Tusk is better. I really only see it used as a Rocks lead that can actually handle the Donphans, which is fine, but I just don't think that's good enough.
Volcarona to A. The reason I'm not nominating this to A+ is because I think it really does need to be an active Tera threat every time you use it, and that's a lot of opportunity cost. With that said, base PhysDef Volcarona has really nice use as a pivot because of its reliable recovery, and ability to counter Valiant, check Tusk, Chien Pao, and Ape, and heal and fish for burns against Roaring Moon, Dragonite and Kingambit. With Tera Fairy, you smash all of the above, and also turn into a 6-0 machine because Fire-Fairy coverage is really good and reliable recovery means that getting multiple Quiver Dance boosts is very realistic. Sure, Ting-Lu, Clodsire and especially Skeledirge can stop you, but I can't tell you how many times I just win on team preview against teams that don't have one of them because Tera Fairy means you resist Sucker Punch, and DD Dragonite can't win the 1v1 against a boosted Volcarona. At the very least though, I would definitely argue that nothing else below A+ is as capable of ripping through teams, and it's better than Iron Moth, the only other offensive Pokemon in A- and A, because Quiver Dance gives it a combination of power, speed and bulk that Moth can't reach.