In ages past, the Kingdom of the Vale, a mighty and flourishing realm, fell into turmoil. The ruler's two sons turned against each other, unleashing the powers of their Legendary familiars—Reshiram and Zekrom—and disturbing the Dragon Force that supplied the kingdom with energy. With the help of the Mythical Pokémon Victini, balance was restored and the Dragon Force was bound by the Sword of the Vale. Should the Sword be moved, devastation will loom again. Damon, a descendant of the now scattered People of the Vale, is attempting to restore his people's kingdom to its former glory. He manages to summon Legendary Pokémon Zekrom, with the aim of lifting the Sword of the Vale and harnessing the power of the Dragon Force himself. Meanwhile, Satoshi and his companions visit Eindoak Town, located at the foot of the Sword of the Vale. Confronted with Damon's scheme, they lend a hand to Victini, guardian of the Vale, in stopping the plan from coming to fruition and preventing a repeat of the tragedy that occurred a millennium ago.

When researchers discover and exploit a fossil of the Mythical Pokémon Mew, they unleash a creation that goes against the very laws of nature: Mewtwo, a Legendary Pokémon intended for use as a tool of destruction. But as Mewtwo becomes aware of its own dubious origin, it begins to resent its human creators and seeks revenge—and Satoshi, Pikachu, and their friends find themselves at the center of its rampage! With the future of the Pokémon world at stake, will our heroes be able to overcome Mewtwo’s challenge…and will Mewtwo be able to find a new meaning for its life? (Source: Official site)

Satoshi and his friends get lost in an unknown wasteland. They eventually come across a Water Pokemon Show performed by the star of the Mariner Troupe, Hiromi. Hiromi is a descendant of the troupe of Water People able to communicate with water pokemon, and she tells our heroes the legend that's been passed down by her people for generations. According to legend, a temple the Water People built called The Water Temple Akuusha rests somewhere in the ocean, and a treasure called The Water Crown is hidden there. It's said that no one has ever seen this treasure, but that changes when a Pokemon Ranger named Jack Walker (aka Jackie) appears to chase aftert it. Jackie is on a top secret mission that has him protecting the egg of the leader of the water pokemon, Manaphy. This pokemon, called the Prince of the Sea, needs to be taken to the Water Temple Akuusha, so Satoshi-tachi and Hiromi decide to help him. Along the way, a pirate named Phantom attacks our heroes from his great submarine. Phantom plans to use the Water Crown's power to help him conquer the world, but he'll have to solve the mystery of Manaphy's egg first. When the Rocket-Dan get into the mix, Jackie uses his Capture Styler to borrow the power of a nearby pokemon to stand up to them. Satoshi and Pikachu enter the fray, but they still have to contend with the attacks of Phantom's powerful high tech mecha! Suddenly, the egg starts to shine with a vivid light, and Manpahy is born! What is the mystery of the legendary treasure? What mysterious powers does Manaphy have? Can Satoshi-tachi and Jackie complete their top secret mission? The journey to reach the Water Temple Akuusha has begun!

When Satoshi oversleeps on his 10th birthday, he ends up with a stubborn Pikachu instead of the first partner Pokémon he wanted! But after a rocky start, Satoshi and Pikachu become close friends and true partners—and when they catch a rare glimpse of the Legendary Pokémon Houou in flight, they make plans to seek it out together, guided by the Rainbow Wing it leaves behind. Trainers Makoto and Souji join Satoshi on his journey. Along the way, Satoshi catches an abandoned Hitokage, raises a Pokémon from Caterpie to Butterfree and then releases it to follow its heart, and meets the mysterious Mythical Pokémon Marshadow. When they near their goal, the arrogant Cross—Hitokage’s former Trainer—stands in their way! Can Satoshi and Pikachu defeat this powerful Trainer and reach Houou as they promised, or will their journey end here? (Source: Official site)