Pokémon Heroes

Gekijô-ban poketto monsutaa: Mizu no Miyako no Mamori Gami Ratiasu to Ratiosu is a movie starring Eric Stuart, Madeleine Blaustein, and Rachael Lillis. Two thieves take control of an ancient weapon designed to defend the canal city...
Ash, Pikachu and his friends try and stop a pair of thieves hiding out in the canals and alleyways of Altomare, the age-old water capital. Joining the adventure are two new legendary Pokémon, a pair of siblings named Latias and Latios, who serve as peacekeepers and protectors of the Soul Dew - a priceless treasure with a mysterious power.