Riko and Nyaoha were practicing battling with Roy and Hogeta! ...But then an accident happened and Nyaoha injured Riko... Riko tried to reassure her, saying, "It's not your fault, Nyaoha," but Nyaoha seemed to have something on her mind... Nyaoha jumped out of the Brave Asagi and headed to the breeder's house where she was born and raised...!?

The Rising Volteckers arrive at the beach in the Paldea region. Rico and Roy enjoy spending time with the sea Pokémon, but Hogeta is swept away by the sea and in grave danger! The one who saves them from this predicament is the sea hero, Dolphinman! Roy is thrilled by the cool Dolphinman. Meanwhile, someone is plotting to film Dolphinman's transformation scene, which "no one has ever seen before"...?