Famous Pokemon trainer Ash Ketchum is en route to a special water race for Pokemon in Altomare with his loyal companion, Pikachu. But when they arrive, they discover there's bigger game afoot than the race. Annie and Oakley are a pair of female villains determined to steal the all-powerful jewel known as the Soul Dew. However, the jewel is guarded by two especially vigilant Pokemon, Latios and Latias, so the thieves must capture the creatures before they can make off with the enchanted artifact. Annie and Oakley are able to put Latios in captivity, but not before Ash and his friends arrive on the scene.