Although I can't contribute much to the metagame discussion other than oneish-liners, since I was multitasking during my 3 tour games (dont watch my game 3 it's so bad) and have no other play time, here are my thoughts on the mons I played 1 or 2 games with and remembered:
Vaporwave: Very fun. I'm glad it worked in at least one game for me. Didn't feel top-tier or meta defining, but an effective mon nonetheless. Maybe it's even better than I give it credit for.
Darkarrot: Kinda underwhelming. That, or Grass/Normal/Water coverage is terrible and I should have picked different moves, or it's not good with specs, or Slush Rush is its worst ability. I also used it on the team where I opened builder and slapped stuff together, so that probably didn't help. This probably means Hail/snow isn't viable at all, unless you're using chilling reception anyways and happen to have an ice-type or blizzard.
Cateloon: I mean, it clicked spore and got 2 KOs across my 2 games with it, so I either got lucky/positioned well, or it's somewhat good at making progress.
Flamester: Pretty solid. Fire is always a helpful type, Shield Dust is cool in general, and it gets wicked blow and roost.
Webs: Kinda bad when the best removal also gets rid of the opponent's webs. Could work better than when I tried, but they seem viable.
Slowghast: I'm pretty sure we all knew it was going to be good going into the tour, and it didn't disappoint. Unless you look at it's win rate but shhhh. It's solid defensively, but something I think even I knew I had to prep for. (not really tho I thought Bonedos was gonna be the Landot of this)
And yeah, that's about all I can piece together. If you want the team I watched 2 replays before making to ensure its effectiveness, it's
here. Good luck with it- you probably need it lol.