Pocket Monsters the Movie: The Guardians of Altomare

In the lengendary water city of Alta Mare, there is a legendary stone known as the Drop of the Heart. It is guarded by two legendary Pokemon, Latias and Latios. When two thieves, Zanno and Lion, steal the stone and capture Latios, Latias elists the help of her new friend Satoshi to save Latios. The rescue was successful, but a freak accident sends the city's water into chaos. Now the city depends on Latios and Latias to save them from destruction.