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Gen (Riley) made his first appearance in the anime in DP110. He is a Trainer specializing in Steel-types and is currently staying at Iron Island for the study of said type. Due to the strange behavior of the Steel-types on the island due to Team Galactic, he decided to investigate it with the help of his Lucario. In DP111, it was revealed that Riley is training to be a wave guardian with his Lucario and as such he is able to use aura effectively. He is able to create shields with his aura as demonstrated in the episode. After Team Galactic put bombs under the island after their plan was foiled, Riley and his Lucario trapped the explosion using their aura and sent it away from the island. Later, he decided to help Professor Karashina in the study of the island so that he could know it better.