Morrison sent Beldum in his battle against Ash's Pikachu. Beldum attacked with the only move it knew, Take Down, though Pikachu dodged and used Quick Attack and Thunderbolt. Beldum endured the attacks and hit Pikachu twice with Take Down. Pikachu clashed with Beldum, using Iron Tail against its Take Down and both Pokémon were defeated. Later on, after Nurse Joy gave Morrison his Beldum back, Morrison came out of the Pokémon Center to sleep on a hammock on a tree. His Beldum carried him up to the hammock; Ash tried to sleep on the tree as well, but nearly fell down. Fortunately, Beldum saved him, whom Morrison lent one of his hammocks. The next day, as Ash and Morrison were having a lot of challenges to test each other about, Beldum and Pikachu were captured by Team Rocket. Fortunately, Morrison and Ash worked together and bashed Team Rocket onto the cages, freeing Beldum and Pikachu. As Pikachu went on Beldum, the latter attacked Cacnea with Take Down while Pikachu hits Seviper with Iron Tail. The former fired Thunderbolt to attack Team Rocket while Beldum's Take Down blasted them away.
In the first stages of the Pokémon League, Beldum evolved into a Metang, learning new moves.