click on the sprites for some sample sets when I can think of something
Stored Power is a nice addition to Reuniclus' movepool, but what benefitted it the most is Zor (and Krook) getting snapped out of the dex, and Hydreigon looking to be an OU mainstay. The seemingly lower power level compared to last gen (no megas/Z moves) means its bulk looks even better than before, so its setup sets look really promising (especially Acid Armor + CM with Stored Power) and, should dynamax stay, Focus Sash + Trick Room can help a lot to deal with the faster Dynamax sweepers (no Endeavor shenanigans though, that thing doesn't work as well against dynamax mons).
Hydreigon's staying in OU and Primarina, MAlt, Alomomola, Chesnaught and Amoonguss aren't there, so Crawdaunt is looking to be an even more terrifying breaker this gen. Its movepool didn't really get anything notable (unless you're the one guy that's going to try and run Nasty Plot Crawdaunt), but it's not like it needed anything but its STABs to put in work. Dynamax is also a nice tool for it to remove the band's lock and blast something away when they least expect it.
I had some hopes for Silvally when I learned that Multi-attack got boosted, but its physical movepool is still one of the worst in the game, so ... Yeah, I definitely don't expect it to be good this gen either. Maybe you can do something with mixed offensive sets, but 95 attack/SpA is too low for that, especially since it can't hold a Life Orb.
The zolt fossils are looking like solid breakers for the tier, each having different desirable traits (Dracozolt has a better typing defensively, higher attack thanks to Hustle and higher speed while Arctozolt has a better STAB combination -especially with access to Rock-type coverage for Heattom and Frosttom-, slightly better special bulk and accurate moves). Dracozolt alone might be enough to justify having a ground-type in every team, cause that thing's Bolt Beak is no joke (it's strong enough to 2HKO Kommo-o who resists it, as a reference). Not 100% sure that Dracozolt will drop, but I haven't seen it much in OU so ...
Zor's gone (insert crab rave), so it may be time for Escavalier to shine, especially now that it got good coverage for Steel-types in the form of Close Combat. The speed is definitely an issue for it though, especially now that almost all fairy-types get Mystical Fire.
Alcremie is another mon I have some pretty high hopes for. Sylveon being around may seem to give it competition, but Alcremie has access to Aromatherapy (Sylveon doesn't get Heal Bell for now),Recover (healing itself is not a loss of momentum as huge as Wish + Protect) and Aroma Veil (immunity to Taunt means you can't prevent it from healing) so there's a pretty clear difference between the two. I can definitely see Alcremie fit nicely in bulky offensive teams that don't want Wish support as much as fat balances, either fulfilling the role of a cleric, or making use of its coverage for a recover + 3 attacks set.
A lot of stuff that either walled or gave Salazzle competition is gone with Dexit, so she may be a solid pick in UU this gen. Only big issue for her are the various rock-types we may get, such as Rhyperior or Coalossal, that can easily tank its STAB combination, and Salazzle's best coverage move for them is ... Dragon Pulse ? Also Mantine and Milotic can easily wall Salazzle since you can't muscle through them with a Z-move (wym Dynamax isn't banned yet ?). Sub+Toxic sets are also going to do pretty well now that Gligar is gone, and there's nothing immune to Toxic no- oh right, Rapidash.
Zor's gone, so Ice-type breakers may be more interesting now. Vanilluxe is the one that looked the most promising (of the ones that were garbage before) thanks to Snow Warning negating Leftovers, Freeze-Dry to hit waters, Flash Cannon to snipe the opposing Ice-types and Taunt to prevent Wish passing from the likes of Sylveon on top of having a usable speed tier to not be deadweight against offensive teams, but Abomasnow has an additional Grass typing letting it switch into Water-type comfortably, and access to Earth power to smack Steel- and Fire-types (which Vanilluxe can't really hit). Mamoswine is Mamoswine, except now we don't really have anything to keep it in check defensively (except Rotom-H -which may actually be OU- and Avalugg, wow).
Not really sure what to make of Rotom gaining access to Nasty Plot as all its forms except Fan and Frost are getting walled by Dragon-types, but that's still a nice perk to have. Cut and Frost will probably be the best abusers of this as they have the coverage to break ground-types with ease.
To briefly mention other stuff, Indeedee's Psychic Terrain could be huge in this meta, as I feel priority users will be pretty strong (especially Mamo and Daunt). Orbeetle looks like a decent webs setter cause Webs + U-turn + Recover, but I think Araquanid and Galvantula will still be better options as suicide leads cause they can apply more pressure on hazard removers thanks to their high power. Chandelure has a lot of nice perks (spinblocking, wallbreaking, dealing with basic steel+fairy cores) and most of its "checks" are gone so it'll probably be a big threat.
