A white mist singing voice—it's the rumor of a mysterious Pokémon that guides and saves ships lost in the fog with its song. Having received information that its true identity is the radiant Lapras, the Rising Volteckers head to the rumored sea area. They might just meet the Lapras of the Six Heroes...! Rico and Roy's hearts are filled with anticipation, but as the Brave Asagi lands and sails across the sea, it is suddenly enveloped in fog...

Just when it seemed that the matter was settled after Roy's feelings reached Lapras of the Six Heroes, a black Rayquaza, the very thing the Rising Volteckers had been pursuing, suddenly appeared in the sky! Roy was eager to battle, but Amegio of the Explorers intervened! Faced with Rayquaza's enraged reaction to the attack, Rico and the others were in a pinch... At that moment, Terrapagos's body began to glow—!?