Not gonna talk about any eligibility stuff, because that's always going to be an inherant issue in a World Cup format and I imagine some Europeans will do that anyway.
I didnt personally like Pools as a format compared to weeks. There were essentially 2 dead weeks at the start of the tour, followed by too many games to really keep track of how every other team was doing. Much like
Aqua Jet and
FatFighter2, I'd prefer a weeks based format like PUWC. It'd make the tour last longer, but I feel it'd make the tour significantly more Hype.
Only going to talk about a few teams here.
Pools vs Fardin
I am still annoyed I lost this, didnt pay attention in the calc to figure out that I had accidentally kept Lunala's Shadow Shield Broken when looking at Marshadow calcs. Anyway, the idea behind this was: I dont want to lose to Magnezone, so I might as well try and build to Solgaleo's strengths. Those strengths being, Future Sight + Teleport. The big issue with Future Sight is Yveltal + Necrozma-DM being on essentially every team these days, so I wanted to pair Future Sight with something that can come in on Yveltal easily and force it out. Dragon Tail Eternatus makes sense for this, also phazing Necrozma-DM. Kyogre and Marshadow just make sense as future sight partners, and I still had Roar on Kyogre for the same reason as Eternatus, while Future Sight + one of Marshadow's STABs theoretically 2HKO's everything. Lando-T then provided more pivotting and the rocks that NDM lacked. Overall I still think this is a pretty cool team, especially if you think Magnezone is possible from your opponent. Just be wary of offensive Eternatus, that is a big issue for this team overall.
Pools vs Fatfighter2
Darmanitan is one of the best mons in the tier, and Life Orb Zekrom has some nearly auto-win matchups against some of the teams FF2 had been using (Tapu Fini + Heatran in particular folds like wet paper to Zekrom). I got the matchup pretty badly wrong here in prep, I was not expecting any sort of HO, and it kinda shows. Then I forgot what Shield Dust does turn 1 and misplayed around the webs setter too! Oh well. I still like this team, Zekrom + Darm + Specs Caly have really nice synergy for each other, and you can even change the Zekrom set to lefties if you're ok with making your Groudon matchup a lot harder.
Semis Vs Plat
I thought that I was going to be HO'd before this game began, in part because I know that Plat likes that in USM, and in part because I thought that Solo + Dave as his teammates and most obvious support also prefer HO in a lot of tiers. As a result, I thought that Scarf Lando-T could be a genuinely good and unexpected option. It didnt do much in the game itself, but I still believe it has genuine potential as a set, giving you essentially a guaranteed fast defog against HO teams, as well as pivot support + Intimidate and checking Zekrom and Calyrex-S (without a sub up). Specs Calyrex can normally force at the very least a trade against HO when webs are not up, and that's assuming Sucker Punch Yveltal too. Jolly Banded Marshadow forms a nice Double Ghost core that I felt should leave me solid enough against most Calyrex sets, between Yveltal, Scarf Lando-T and its Shadow Sneak, but I was caught off guard with SubSeed in the game. Got outplayed quite significantly by Plat in this one, but I still feel the team is decent (although I have made Marshadow Bulk Up with Spell Tag since).
The team environment we had was great, everyone was chill and having a good time. I cant wait to team up with these lads for next years WCUP. I'm just a little ashamed that I lost when my team was counting on me to take things to a tiebreaker, especially as it didnt come down to matchup or luck or something, I just got outplayed.