>>35175725He only needs to do 1 trial on each island to face the Kahuna, so that means he'll only have to get 4 more.
UlaUla - Electric trial and Ghost trial.
He already has the Electrium-Z so it only leaves him doing the Ghost trial even though none of his team know any Ghost type moves, that makes me think they may switch it up and have Totem Togedemaru and for him to get the Steelium-Z (since Moylane is showing up soon) Pikachu knows Iron Tail so it's viable for use, I would like to see Jessie take on Totem Mimikyu, that'd be cool.
Grand trial - Nanu, Darkinium-Z, if Torracat evolves, it can be used for Incineroar, it can also be used for Lycanroc's Bite attack so he will definitely get that.
Poni - Dragon trial and Fairy trial.
He doesn't have either of those types nor do any of his Pokemon know moves of those types, Poipole has a chance of evolving, becoming part Dragon type so it can use the Dragonium-Z then.
Grand trial - There's most likely going to be a storyline involving Hapu becoming a kahuna, Ash doesn't own any Ground type Pokemon nor do any of them know any Ground type moves so Groundium-Z has no purpose for him.
It's pretty obvious what they're gonna do.