After Erika caught her Plusle, Crystal wanted another Electric-type Pokemon and decided to catch Minun. She and the gang searched for a Minun and discovered a Minun trapped in a Pokemon hunter's trap and Crystal freed Minun and Minun decided to travel with her.
Minun is a very caring and playful Pokemon. When Crystal rescued her from Team Rocket and a Pokemon hunter, she decided to travel with her new trainer. Minun loves to play with Erika's Plusle and the two are often a pair.