It's 5 am here and I am at the airport trying not to sleep. Good moment to put some thoughts about some Mons of the Tier, especially since not many people will be enraged at my usually controversial opinions
Has some defensive and offensive counterplay, it for sure isn't Annihilape. The counterplay is not useless without him in the Meta, Paldean Water Tauros checks Kingambit, Floatzel, Cinderace, Great Tusk (outside of BU and Band) , Normal Dragonite, some Baxcalibur and Scizor among others. Pdef Quaquaval is the same, but with worse bulk, trading it for Roost, U-Turn and some sweeping potential. Fire Tauros can spread burns and check Meowscarada and Breloom. Iron Hands can be a win condition for some teams, same for BD Azumarill. Tera Pex, Alomomola (Fairy + Play Rough) and Dondozo are good Mons. Pdef Volcarona burns others Mons, not only Chien Pao. Lokix is bad vs balance and Stall, but very good vs offense regardless of Chien Pao. Slither Wings is another First Impression user. Weather sweepers exist to RK and Torkoal itself is quite bulky. Tinkaton puts Rocks vs Hatterene, paras Gholdengo and sometimes sweeps. Chien Pao shouldn't be Quick Banned, but suspected instead.
Now, if it is suspected, I will still vote Ban, it's just not a super obvious one like Annihilape, we should give him a chance. I would vote Ban because Band + Tera Dark is not the only set to account for and it has enough moves, items and Tera options to overwhelm every single check, combined with enormous speed and power. Despite not considering it Quickban worthy, I still consider it broken enough.
Greninja: Didn't have the opportunity to play with it in the Meta (got released yesterday and I am traveling) but Specs set alone is A+ Rank for me and very close to being broken with that infinite movepool, high speed and power (+ option to run hazards). Of course, not to the degree of Chien Pao and this veredict might change when I actually play with it, but from Theorymon perspective, it's almost as strong as in SM ( and I considered Protean Greninja broken in SM, unlike Ass variant) despite the nerf. This is mainly due to recovery nerf and some former checks (Magearna, Tan growth, Toxapex, Kyurem, Blissey, Primarina) either not being present or being worse than in SM.
Garganacl: Yes, new sets are being discovered with this guy, but so is new counterplay. Very annoying Mon, but not problematic for the Tier.
Espathra: SS Poltergeist but actually good. It will sweep some teams and will do 0 to others. Match-up fishing is not a reason for me to Ban a Mon and this one requires a lot of support + commit to Tera to work. Some teams aurolose to it, but others autowin without even preparing specifically for it. Not a problem for the Tier.
Volcarona: Very good Mon, but far from broken. We already had this Mon in DLC1 Meta of SS, with Boots and no Heatran. It was very far from broken there. With Tera, is better than DLC1 SS one, but there are still sure counters and very solid checks. Every physical Tera Fire Mon (there are a lot viable ones, explore them) . Toxic Clodsire. Skeledirge except the very niche Tera Water. Pex vs no Psychic. TW Pult. Flash Fire Mons. Facade Mons (seen some Dragonites with that).
Dragapult: Tera Water and Electric on Specs are good.
Iron Treads: I still consider this guy a good alternative to Tusk. Tusk is better as offensive Mon, but Treads is better as Rocks + Spin Mon with some good role compressions and better defensive typing.
Kingambit: I predict this guy to be a B rank at most in like 6 months when people realize how easy it is to prepare for it due to that speed. Right now it's still good and it will always be, but it will end up very far from a dominating force.
Corviknight: Pdef=big trash. Sdef=Good, Defog or BU. Won't elaborate.
Iron Valiant: Just like Greninja, might become banworthy in the future due to Specs alone, but has many amazing sets. One of the hardest to check Mons in the Tier. Not broken yet.
Ting Lu: Standard set= Bad. Weird innovations (Band, Restalk, trap + Taunt, etc.) = great potential.
Garchomp: Unironically great when offensive, be it SD or Mixed Tera Fire. Extremely hard to avoid losing a Mon to it, unless using Stall.
Glimmora: Just like the 2 guys above, offensive sets are way better on this.
Hippowdon: Along with Tusk (who is a little worse at the task due to lack of recovery), it's the one guy that prevents Band Pawmot from being one prediction away from destroying everything slower than it.
Iron Moth and Slither Wing: Lots of unexplored Tera and moveset potential here, this will increase usage in the future.
Eeveelutions: Will keep them to myself for now, but I see niches for every single of them (including Glaceon of course). This didn't happen even in early SS.