Anastasia and Alexei are ecstatic when they wake up one morning and realize they finally get to follow their dreams. Getting their first Pokémon from their aunt, the Pokémon Professor Alexandra Yew, they leave their home of Aventurine Town in excitement. As the two meet new Pokémon and traveling companions, they're unaware of events that could change their lives forever. Team Summer's recent scramble for a new leader is soon to attract attention from an unknown group - one that will jump at the chance to claim Xandau as their own.