Tierno's Raichu is one of the new companions
Tierno got after the summer camp ended.
Tierno has taught it his rhythm strategy and dance moves.
Tierno revealed it when he thought that since
Ash Ketchum was going to challenge the Miare Gym, it might be better for him to train with an Electric type as his opponent.
It was captured by Team Rocket and shocked the other Pokémon in the cage while attempting to escape. After escaping and reuniting
Tierno, it participated in a double battle against
Ash's Pikachu and
Ash's Goodra. It got knocked out by Dragon Pulse.