Ash Ketchum is the strongest trainer in the world, aiming to be friends with every Pokémon in the world and become the Pokémon Master. He travels around the world with his Pikachu, hoping to meet more friends on his way. Now, he plans to make his adventure in the Terra region, a region known for its marvelous scapes unimaginable in other places. At the same time in the Terra region, a boy named Halley starts his journey as a Pokémon trainer. He expects his adventure to be just like the others, but an encounter causes a twist in his tale...