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I wonder if they're pseudo-legendaries, cause that is a nutty ability. Looks like it's a 30% chance ("may cause") but that's still really REALLY strong since it's not just with contact moves.
If Gliscor loses Roost and Toxic, that's actually a huge nerf to its viability. It would likely keep Knock Off though, which is really important in giving it a niche over Lando-T.
I don't remember if Tera Flying is still a really common option on Kingambit (and to a lesser extent Gholdengo), but IMO a problem that I'd notice when running Bulk Up on fat Tusks with Spin was that anything that was a Flying type (whether Tera or naturally) could sit on me pretty easily...
hurts to see Revavroom not on the ranking list, but unfortunately appropriate given the stat spread and (lack of) coverage tools it gets sadly
WHY GAMEFREAK, IT HAS SUCH A COOL DESIGN
Another unconventional mons that I think may have an OU niche depending on how the meta shakes out:
Bellibolt - 109/91/83 defenses are not bad at all, pure Electric is a decent defensive typing (yes, weakness to EQ sucks but it's only a 2x weak), Static is a great defensive ability, and it...
YES
YES
FINALLY GODDAMN IT YES
okay I wish it was Shore Up, and that Gamefreak gave Regirock Recovery too but still
this is actually a big deal because it's really quite tanky - yea sure it doesn't have Sand naturally, but that ability is honestly SUPER good (free Ghost resist is really...
sad that outside of Paradox Volc, not a single new Bug type even hits 500 BST
like cmon Gamefreak
And why make the sick DUNG beetle a Psychic type? Why not Ghost? Or GROUND?
remember that it's also straight-up immune to Burns, meaning it doesn't have to worry about Scald or Flame Body (or Wisp, but that's less common) at all when setting up
While there are some obvious winners like the pseudo and other legends, I think knowing the movepools of some mons is really important to determine their viability.
really wish our beautiful engine was more defensively oriented with the stat spread, but at least it has a good defensive Ability (would have loved Flash Fire/Thermal Exchange or Levitate)