After Capturing Meloetta, Team Rocket has brought the Undersea Temple to the surface and used her song to obtain the Reveal Glass. Team Rocket now plan on using the Reveal Glass to summon the forces of nature. Tornadus, Thundurus and Landorus to take over the Unova region. Now Ash and his friends have to save Meloetta and put an end to Team Rocket's plan
A young boy named Ash Ketchum embarks on a journey to become a "Pokemon Master" with his first Pokemon, Pikachu. Joining him on his travels are Brock, a girl-obsessed Rock Pokemon Trainer, and Misty, a tomboyish Water Pokemon Trainer who may have a crush on him. Ash and Co. end up traveling through various regions, including Kanto, the Orange Islands, and Johto, and then enter the Pokemon League competitions there.
Along the way, they run into many confrontations with Jessie, James, and Meowth, a trio of Pokemon thieves who are apart of an evil organization called "Team Rocket". But every time Team Rocket try to do their evil deeds, they fail thanks to Ash and his Pokemon.