Pokémon Heroes (2003)

Director: Kunihiko Yuyama
Cast: Ikue Otani, Inuko Inuyama, Mayumi Iizuka, Megumi Hayashibara, Rica Matsumoto, Satomi Korogi, Shin-ichiro Miki, Yuji Ueda

Synopsis:

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.