Ash and friends join Cameron as he journeys to Humilau City where will challenge the Gym in hopes of winning his eighth and final badge. On the way, Ash and Cameron are separated from Iris and Cilan and must now find their way to Humilau City on their own. After spending the night in a cave due to rain and overcoming some perilous treks, they finally find Humilau City. There they meet the Gym Leader Marlon, who specializes in Water-types. The battle gets off to a rough start when Cameron realizes he forgot to bring Riolu to the battlefield but quickly thinks of another way to hopefully win his badge and gain entry into the Unova League.