When Ash, Pikachu and their friends Iris and Cilan are on the way to their next stop of their journey, they accidentally save the injured Pokémon Keldeo. After that, their train is attacked by the Legendary Kyurem, a Dragon-type Pokémon. To defeat Kyurem, Ash and his friends have to help Keldeo rescue its friends Cobalion, Terrakion and Virizon from Kyurem to form the Swords of Justice.