Thank you very much for sharing this unique and creative team :)
One question though. How do you deal with Trick Room ? (Kingambit, Ursaluna and Hoopa especially). I was completely destroyed even if I almost managed to play around the TR turns (Ursaluna with Healing wish is a nightmare).
Maybe Tera Ghost Lando (instead of Tera Water) can wall Ursaluna's Facades ?
Trick Room is certainly difficult, but we do have some tools. I wouldn't advise using Tera Water Landorus, since this will hurt the rain matchup a lot. The key against Trick Room is usually to sweep with either Thundurus or Kingambit. Most Trick Room teams will be vulnerable to at least one of them. Hatterene will usually KO itself early in the game with Healing Wish. Hoopa-U and Cresselia are the two things that usually need to be chipped for Thundurus to win. Ursaluna is definitely the main breaker, but it needs TR to function since much of the team can KO it easily (Valiant CC, Thundurus Tera Blast / Grass Knot, Kingambit Low Kick). During these turns, you can position yourself well to deal with Ursaluna. For instance, you could use Goodra Draco Meteor to prevent an easy entrance from Ursaluna, forcing Cresselia to Lunar Dance, perhaps prematurely. And if Cresselia does this anyway, Goodra is a fairly easy sack here, and if needed you can switch Landorus on the Headlong Rush. If Hatterene has fainted, Landorus can also set Stealth Rock. This is helpful for chipping Hoopa and Cresselia, setting up for a possible Thundurus win.
Another thing that sometimes just wins is using Kingambit Swords Dance lategame on the last turn of Trick Room. Most Trick Room teams will just drop to +2 Tera Dark Kingambit.