The film is set in the Venice-esque city of Alto Mare, protected by the dragon siblings Latias and Latios. Their father, also a Latios, is said to have saved the city from an evil Pokémon Trainer and their Kabutops and List of generation I Pokémon#Aerodactyl whilst transforming the city's streets into canals. The citizens built the Defence Mechanism of Alto Mare (or “D.M.A.” for short) to protect the city if necessary, but have never had to use it. The father Latios died, leaving behind the Soul Dew, said to contain his own soul and can power the D.M.A.