Legend speaks of a hidden Sea Temple created by the People of the Water, which holds a powerful treasure known as the Sea Crown. Ash and Pikachu meet Lizabeth, a descendant of the People of the Water, and Jackie, a Pokémon Ranger on a secret mission to protect a Manaphy Egg and find the Sea Temple. The Phantom, a nefarious pirate, plans to obtain the Sea Crown and take over the world-but first he needs the Manaphy Egg! Now Lizabeth and Ash must help Jackie protect the Egg and stop the pirate!