From Z to Shining Z!

With Professor Kukui down to his final Pokémon, the Island Guardian of Melemele Island, Tapu Koko, intervenes and requests to be Kukui's final Pokémon in order to battle Ash. Ash, with Naganadel and Pikachu remaining faces one of the toughest battles he has ever had. Will Ash manage to break through and defeat the Island Guardian?