The city of Alto Mare is protected by the dragon siblings Latias and Latios. Their father, also a Latios, once saved the city from an evil Pokémon Trainer and their Pokémon, transforming its streets into canals. The father Latios died protecting the city, leaving behind the Soul Dew containing his own soul. The citizens built the Defense Mechanism of Alto Mare (D.M.A.) to protect the city if necessary, using the Soul Dew as a power source, which was hidden away to prevent its usage.