Benji and his dad were part of a Mountain Patrol. They used Ledian to help them and trained them by traveling through the forest. When he was showing his Ledian training, Team Rocket came and took Pikachu and Togepi. Team Rocket were defeated, but were blasted off with Pikachu and Togepi. Benji used Ledian to track them and help them get off. Team Rocket came down and took Ledian, but Benji's father came and used Pidgeotto and his Ledian to free Benji's Ledian, then defeat them. At that night, Benji's Ledian's back glowed, proving Benji was a capable ranger.
Ledian was Benji's Pokémon partner. It managed to track Team Rocket, Pikachu and Togepi and save them.