Cain LaRue is a boy from the Byxbysion Wasteland, where he lived with his mother and his older sister Aya. He helps the player throughout his time in Reborn and specializes in Poison types. He was originally the back up leader for the Venom Badge, but left the position to Aya after he distanced himself from his family.
He becomes one of your rivals, as well as Fern and Victoria.
Cain has a tendency to be a huge flirt, often hitting on people and makes jokes involving innuendos.
Cain is first met at the Grand Hall, shortly after the player has chosen their start. After a bit of flirting, Cain happily takes it upon himself to show the player around the Grand Hall and give them a battle, setting off on his journey once he sees that they are in good hands.
Cain is not encountered again until the player reaches the Coral Ward. Here, Cain arrives just in time to help Amaria save an Oshawott stranded up in the water. Sending his Grimer to safely navigate the poisonous waters (and singing a heroic song all the while), Cain manages to rescue the Oshawott. At first, Cain is content to just head on his way, but when the Oshawott continues to follow him, Cain gives into its adorable appearance and takes it on its team despite its lack of a Poison type, and has a battle using it against the player to calm its jitters.