>>33867064PWT would be the best thing they could do
It ties well into the story with Kukui's dream
>"To think that, someday, the kiddos in Alola will be able to go from being the island challenge champion to the world Champion! And then, when we have our own Champion, they can show the rest of the world what's so special about Alolan Pokémon and their Trainers, yeah!"Gives us the perfect opportunity to fight the Kalos Leaders and Alolan Captains with full teams, the rest can be basically copy/pasted from BW2, maybe adjusted to include Megas and some Gen 6/7 mons
Battle Tree is already a mini version anyways, so I can definitely see it getting expanded
It would be the perfect celebration of Pokemons history as we finish off the pure handheld saga and move into the Switch age