Not sure how I missed this, I briefly read the past points so a lot of this might just be re-iteration but thought I might throw my thoughts here as well.
Like many others before me have pointed out, I definitely think we'll be seeing Gliscor much more due to Defog. It has good typing, Poison Heal is a godsend, still has good utility in Knock Off / Taunt / Toxic / Roost, hell I can even see a cash set like Defog / SD / EQ / Knock Off or Facade being run if you desperately need a more aggressive Defogger for whatever reason lol. What I'm trying to get at is this thing's gonna be versatile af and I'm actually pretty excited for it. I think Defog Lando-T is an unmon tbh, would much rather keep using it as my rocker.
THIS SHIT gets Defog somehow and I really hope it doesn't see any usage because it's annoying as hell. It might be a bit redundant running this with hazards, but maybe a Defog + status + screens set or something could be somewhat useful?
Naganadel is flames and I can see it running a variety of sets, but NP + 3 atks Dragonium Z is the scariest imo. +2 DD into Draco kills Chansey if it switches in, and +2 DD kills standard Timid Heatran iirc. I can see more Heatrans running SpDef now because of this. Not to mention that its speed tier is stupidly good when you throw in Beast Boost... NP is easy to set up in Toxapex's face, and getting rid of TSpikes automatically is huge too. Definitely has the most potential out of all the new mons.
Blacephalon is complete booty and a shame really, since I love the design. 107 speed is disappointing, getting shut down by TTar every time is a huge dent in its viability since it can't even run HP Fighting lol. I honestly just see this taking over Chandelure's niche in OU and doing a better job. Specs, Scarf, and CM sets are somewhat interesting I guess, but I'm still disappointed in its speed tier and it not being Fairy/Ghost
I don't think people are giving Zeraora the credit it deserves. It might not be a
fantastic mon by most standards, but it still has amazing speed and I can definitely see it running something like Work Up / Plasma Fists / HP Ice / Fire Punch or CC with a Life Orb. It's a pretty good cleaner like that imo, but I'm not sure what other sets it can afford to run with Lando being everywhere. It also takes advantage of Tapu Koko pretty well (bar D-Gleam). It's a cool mon and I'm surprised it hasn't gotten a bit more of discussion.
e: oh yeah stakataka is ass, should've been steel/ghost