Constantly moving throughout the ocean the Temple of the Sea exists invisible to human eyes. It is here that the Sea Crown exists. Phantom the Pirate has captured the egg of a Manaphy, the only Pokémon able to locate the temple. However, his plans are ruined when Jack Walker, a Pokémon Ranger, interferes. Along the way, Ash Ketchum and his friends manage to get caught up in the adventure to return Manaphy to it's home. But along the way Manaphy and May form a special bond.

Source: ANN

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Parent story: Pocket Monsters Advanced Generation