Lemme get in on the discussion
Will probably rank among the top 30, even top 15, and it'll do what it did last gen but even better: Quiver Dance, STABS, and the choice of Max Airstream, Max Mindstorm, or Max Overgrowth. In my brief stint with USUM Battle Spot Singles, I remember a couple people experimenting with more defensive spreads - Mystical Fire will be an interesting move to toy about with regardless of what becomes popular. Another goodstuffs mon to add to add to the many, many threats that terrorise the metagame right now.
I don't think
-Galar will be very good. It depends on what Quick Draw does, and what way its stats are shuffled about, IF they're shuffled at all. It's going to have the tools to deal with most of the popular fat boys, but my honest expectation is that it's gonna be underwhelming and not worth using over regular Slowbro, whose better typing will facilitate some deviations on the standard cores.
will return true to its gen 7 form: disgustingly good at lategame cleanup, and not much else. Revenge killing with priority Max Airstream sounds scary enough, but it's not gonna be single-handedly (wingedly?) winning games left, right, and center. It's not gonna be breaking through walls, and skimming through the top 30 right now, it doesn't really have many favourable matchups imo.
Urshifu, if its movepool is generous and its speed above-average, will be very, very good. I've said this since the moment we found out what Unseen Fist does, which is allow contact moves to hit through protect. Both forms will be very good, but if it gets Knock Off and Sucker Punch, Single Strike style will be favoured over the other. Fairies will become even more popular, make liberal use of the Poison and Steel types that we have access to.
will still annoy Steels with or without Hidden Power, but it's not much to write home about. Body Press won't be that good. It shits on physically defensive Corviknight but that's about it, and I doubt many people will start to switch to SpDef Corv to have a chance at stalling it out. Just run Maranga Berry lmao
makes me glad that Cinderace suffers from 4MSS. He's the hero we need but don't deserve. Will struggle against Rotom-Wash, Rotom-Mow Gyarados, Seismitoad, Lapras, Pex and so on. Not having Z-Belly Drum hurts, and I'm not sure how much it'll try to compete with Primarina given that they perform similar roles.
Don't call it a comeback, because Rain will probably still not be that good. Kingdra will do what it's always done under rain, and Politoed isn't worth using over Pelipper. However, I do think Poliwrath is an interesting choice for a Swift Swim mon. Its CCs hit harder than Barraskewda's, it will have access to Darkest Lariat, it's got better special bulk than Drednaw, but it's not as fast as either of them.
-GMax makes Mimikyu a non-issue and that's all you need to know.
Moves
Burning Jealousy obviously will punish physical setup mons, and, if it triggers the burn, Weakness Policy. We've seen Cinderace use it, but regardless of whether it's physical or special, it's probably not worth running it over Pyro Ball. Now, on something like Volcarona, which sets up itself, it will be very useful if it's a special move. It might be the case that a lot of mons who aren't Fire Type will learn it, we'll have to wait and see. This is all assuming that its BP will make it worth running over other coverage moves.
Grassy Glide, if physical, will be great on Rillaboom. Since it can reset the terrain on switch in, it will appreciate VoltTurn support to let it get in on Water and Ground types and force a switch. I can see Grassy Glide/U-turn becoming its bread and butter moves.
There's been a lot of speculation as to whether
Flip Turn (French: Eau Revoir) will be a Water-type U-turn or not. If it is, I don't really care if it's physical or special, it's going to make the mons who learn it busted (and Water is already a very strong type). There's obviously the dilemma of using it over a valuable coverage move on something like, say, Gyarados - but it's the choice existing in the first place that matters. If it causes Water Absorb/Storm Drain mons to become more popular, then you know the move is doing its job.
That's my thoughts going in. I'm going to bunker down and build a screens team to take hits and get an idea for what's gonna be popular as the meta develops.