Wanted to share some of my thoughts, opinions and drop a couple teams for those interested:
Viable
Most Ubers-Viable Pokemon retain their viability here. I highly recommend you structure your teams more like Ubers teams rather than trying to fit as many sub 350 BST Pokemon as possible.
100/106/124/86/104/90
It's Toxapex, useful for viable physical mons like Koraidon or Ekiller. The dozens of unviable physical attackers that people might try out will also end up getting walled by Mareanie pretty handedly. This mon is decently splashable, and it's an excellent Tspike absorber just as Toxapex originally is. Not using Mareanie in your defensive core is more often than not self-sabotage with how many people think Glimmet is the boogie man and are spamming it.
138/110/90/110/110/30
Cool regen pivot with helpful resistances to things like Kyogre or Miraidon on top of being a Tspike absorber. I think Grassceus is more valuable as it's less passive and Foongus' Spore can find trouble with Miraidon setting up Electric Terrain. Using Foongus in that slot can free up a different Arceus though, like a Fairyceus or Groundceus.
180/130/130/80/80/30
Slowpoke's bulk cannot be understated. Though competing with Mareanie as a bulky water is annoying for it, Slowpoke definitely has more potential for versatility. Simple defensive sets are definitely best for it, but bulky CM variants also have use.
110/150/100/80/80/160
It shouldn't be surprising that Staravia is good. Though, even with Tera boosting its STABs, I think this is the worst Staravia has been in 350 Cup. It's become very 1-dimensional as a Pokemon after losing Roost and Defog, whereas before it could be used as a very viable Intimidate pivot. It performs its 1-dimensional role as a wallbreaker well regardless, especially thanks to Tera.
120/150/90/130/100/110
Hisuian-Growlithe is a very strong breaker. Teams that don't prep for it properly offensively or defensively will definitely crumble fast. If you opt for Choiced, please run viable hazard removal like Gira-O as support for it though. Rock Head is not Magic Guard. This thing will still die faster than you expect vs Rocky Helmets and rocks. Its biggest problem is that the 110 speed tier is pretty fraudulent no matter how strong it is.
160/160/100/80/100/50
I like this guy. Alolan Grimer is a fun soft-check to Pokemon like Hisuian Zorua, Flutter Mane, etc., but it should definitely be far from your only check. Strong 3 attack sets, banded sets, or more defensively-based ones are gonna be your best bet here. Knock Off and Gunk Shot are excellent STABs to fire off of a 160 base attack, and Poison Touch can let you punish Pokemon just for switching in.
90/170/140/80/80/120
Pawniard is still good, but I'm sorry, losing Knock Off is literally just a very big deal. Even beyond that, Pawniard's value around Pokemon like Groundceus, Koraidon, Mareanie and Zacian falls off fast. As impressive as 170 attack is, Night Slash is just a laughable STAB compared to Knock Off. I think calling this a fraud is harsh, but I also don't feel right representing it as a Pokemon "worth running" this gen. I'll still list it here because you'll be able to run it on HOs like Screens/Shed Tail/Webs at the very least to patch up some of its major weaknesses.
70/120/80/170/80/140
I personally consider this to be a fraud despite its obviously high 170 special attack, but it has uses for sure. You're naturally immune to Espeed and Claw from Ekiller, and it has pretty valuable utility moves like Wisp and U-turn that gives it much needed dimension. Tera undoubtedly carries Hisuian Zorua—a +2 Orb Tera Blast can OHKO Ting-Lu when you become Fighting-type just as an example. This feat is completely impossible otherwise. Without Tera, Zorua is a bit of a bum with a very pitiful movepool (literally two 80 BP STABs, one of which also doesn't offer much at all). But this is judging it with Tera still allowed.
180/100/68/120/88/140
Any set other than Flare Boost CM is fraudulent. And this set still struggles, as you're hopeless vs. viable Dark-types without activating Tera and it's not as strong as it looks like it should be because all of its moves have horrible base power. You're still OHKO'ing things like Mareanie with Thunderbolt after a CM (with Flare Boost active) though, so don't think it's that weak.
The Frauds
96/70/84/210/120/120
What is the hype about for this Pokemon? Being "forced" to run teams viable against Toxic Spikes is not the consequence of Glimmet, and it never has been. Not getting steamrolled by Tspikes is just the reward of good building. As a lead, this thing is possibly worse than its evolution due to having a hilariously bad movepool. What good is the 210 special attack when your literal entire movepool is walled by Steels and Grounds? What good is that 210 special attack when the only moves you're using on lead are Rocks and/or Spikes? Glimmora has these same problems, which is why its 130 base special attack is hardly ever important beyond getting off Earth Powers. At least Glimmora has Mortal Spin for opposing leads and a much more expansive movepool in general to actually use its special attack if it wanted to (Earth Power, Dazzling Gleam, Mud Shot primarily).
94/164/114/84/94/126
Just use Koraidon please. Koraidon is stronger. Koraidon has infinitely more movesets. Koraidon has a better typing.
80/60/100/110/110/200
Just use Miraidon please. Miraidon is stronger. Miraidon has infinitely more movesets. Miraidon has a better typing.
120/156/120/80/102/102
While yes, if you hypothetically force something out by some sort of miracle, you will do a pretty big number...what is bro forcing out? It's insanely slow for this tier's standards. The tier also isn't exactly lacking viable Dark-resists, and a lot of things it could hypothetically force out also commonly have either defensive or offensive Tera's in place for it like Zorua-Hisui with Tera Fighting.
136/144/156/76/84/64
A nice physically defensive Ground-type that can remove Koraidon's sun and subsequently wall it, Zacian, Pawniard and many other physical attackers thanks to Whirlwind. And that's about it. If you like a nice momentum sinking Stealth Rocker that can do nothing vs any viable hazard removal and invites in every special attacker in the world, pick Hippopotas. He's a chill sand setter for Houndstone though.
80/90/90/148/108/100
Fringe HO cheese mon and nothing more. It suffers from the same problems that it and Polteageist suffer every time, but it's not useless if you play your Tera correctly. That's what they always say though. It's a fraud.
Teams
Some teams to get started (basically 350 Cup'd Ubers teams by Giannis, Dahli and entroce in Ubers Open finals to show that Ubers teams should be your basis. Give your thanks to them and those that helped them build the original teams):
Got pretty nice results with these teams, though I lost once to a secret assassin sent to sabotage me with a Double Scarf team LOL
