Serena (& friends) (Pokemon X & Y) vs. Nemona (& friends) (Pokemon Scarlet & Violet)
To celebrate the new games and our player character finally having a proper friend group to come for the adventure again, why not have them fight the other friend group we've gotten the joy of having?
Every constant will be use their strongest team at the ends of their games, Pokedex feats are optional, just make sure to say if you're using them or not.
R1 - Serena (Meowstic, Clefable, Jolteon, Absol, Altaria, Delphox) vs. Nemona (Lycanroc, Goodra, Dudunsparce, Orthworm, Pawmot, Skeledirge)
R2 - Shauna, Tierno & Trevor join Serena's side, while Penny & Arven join Nemona's. Like a raid battle but against another team instead.
Bonus Round - The leading ladies throw hands as opposed to Pokeballs. I'd have a round where the groups all fight each other but Tierno solos, honestly.