A few thoughts on potentially bannable mons:
leaning on banning Magearna, it pulls more its weight even in bad matchups; while it has quite a few checks, they are all soft checks and a bad predict costs you the game. It checking Clef is nice, but that just makes it even more indispensable.
it seems clear that when the meta stabilizes, Clef will still be dominating. It invalidates several setup mons, has limited counterplay options, and is hard not to justify it in a team, blanket checking half the tier. Clefable has been moved to the watchlist for now.
Dracozolt seems borderline, it does a nasty chunk to its checks with neutral coverage, and can easily go mixed for DMeteor and FireBlast. Its unreliability and Hippowdon's presence is holding it back – though that shouldn't be the only factor.
Conkeldurr seems fine, boosted EPunches are awesome, but it's very limited by 4MSS; forgoing Façade or any other move is significant cost. Its speed, typing, special bulk and having to run FlameOrb holds it back. The format seems to lack Wispers it can abuse for a AV set, too.
haven't seen many Pheromosa, and those I saw haven't done anything extraordinary. It'll still be on the watchlist, though.
doggo seems healthy to me, it checks Clef and its insane physical bulk helps it vs several threats in the metagame, without being busted itself.
It being comparable stats-wise to Zama-C, but with access to coverage such as EQ and FlareBlitz, utility such as Teleport, Knock, Toxic and Twave, recovery, a signature move that ignores abilities, immunity to Intimidate/Webs, in addition to having an item slot, makes it unquestionably busted. I am no Ubers player, but its lack of presence in Ubers seems to have more to do with Necro-DM outclassing it than it being insanely bad.
P.S.: underrated mons I haven't seen much used/discussed:
Insane speed, and it ignores Unaware and paralysis. It still won't 1HK Clefable at +2, (though +4 will do with IronHead), but with Psychic or Misty Seed (which you can use with Weezing-Galar), Hawlucha is guaranteed to live a Moonblast, which might let it 2HK Clefable and sweep.
at +2 crit (with ScopeLens), Togekiss gets 50% chance of critting, significantly boosting its damage output while maintaining its hax chance. Crits also ignore Clefable's CM/CP boosts, which can be situationally helpful with some (super) luck.