When Ash sees Solgaleo and Lunala in a dream, he makes a promise to them. But when he wakes up, he can't remember what it was! Will the strange Pokemon called Nebby jog his memory? When Ash, Pikachu, and the rest of their friends explore an organization dedicated to Pokemon conservation and care, they discover it may not be as innocent as it seems. Now Ash and his friends will have to work together to protect the people and Pokemon they care about.