Dennis

Dennis is a Pokemon Trainer that appears in Pokemon Reborn: Kanto Quest and befriends Tyler Red and his friends. Dennis is a scientist as well as a Pokemon Trainer and while he journeys through Kanto, collecting gym badges he also takes notes and studies everything Pokemon related that he comes across. He first appears in Mt. Moon, searching for fossils and enlists Tyler and his friends to help him.

Pokemon Reborn: Kanto Quest
Dennis makes his first appearance in the series, searching for 'rare Pokemon' in Mt. Moon. He approaches Tyler, Leira, and Electra and asks for their help in searching for these Pokemon. After allying himself with Tyler and he friends he journeys with them into Mt. Moon. While the group travels through Mt. Moon, they encounter a grunt of Team Rocket, Dennis unleashes his Rhyhorn and quickly defeats the grunt.