This is the 8th Movie. 
In the town of Lohta, a festival is thrown praising "Aaron the Wave Leader Hero" who, according to the legend passed down through the town's generations, stopped a war centuries ago by using the power of "the Tree of the World's Origin." Satoshi and Pikachu participate in a battle to decide this year's hero and after their victory, they are chosen as the "Wave Leader Hero." A grand dance party is held in the castle to celebrate the victor, but suddenly the phantom Pokemon Mew appears and takes Pikachu. Soon afterwards, the Wave Leader Pokemon "Lucario" is freed from his centuries-long seal and meets Satoshi. Satoshi must solve the various mysteries of where Pikachu is, what Mew's after, what the secret of the legend of the Wave Leader is and how it ties in with Lucario's hidden past as he makes his way to "the Tree of the World's Origin" with Lucario. 
(Source: Anime News Network)

After participating in the Johto League, Ash decides to begin anew in yet another journey; this time by himself and Pikachu, in the land of Hoenn. Though he isn't alone for long, as 10-year-old May (whom dislikes Pokemon, but just wants to come along to see the world) travels with him after Pikachu destroys her bicycle. Ash also meets up with his old companion, Brock, and May's younger brother, Max. Together, they travel along in Hoenn, battling Gym Leaders, entering Contests, and other events on the way to the Hoenn League. 
(Source: Anime News Network)

In the town of Lohta, a festival is thrown praising "Aaron the Wave Leader Hero" who, according to the legend passed down through the town's generations, stopped a war centuries ago by using the power of "the Tree of the World's Origin." Satoshi and Pikachu participate in a battle to decide this year's hero and after their victory, they are chosen as the "Wave Leader Hero." A grand dance party is held in the castle to celebrate the victor, but suddenly the phantom Pokemon Mew appears and takes Pikachu. Soon afterwards, the Wave Leader Pokemon "Lucario" is freed from his centuries-long seal and meets Satoshi. Satoshi must solve the various mysteries of where Pikachu is, what Mew's after, what the secret of the legend of the Wave Leader is and how it ties in with Lucario's hidden past as he makes his way to "the Tree of the World's Origin" with Lucario. (Source: Anime News Network)

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