Jasmine holds the position of Gym Leader in Olivine City, Johto, commanding Steel-type Pokémon. She oversees the Glitter Lighthouse, where her non-battling Ampharos illuminates the sea for passing ships. When Ampharos fell ill, her profound compassion led her to initially refuse Gym battles, prompting Ash to journey to Cianwood City for vital medicine. Upon Ampharos's recovery, she accepted Ash's challenge. In their Olivine Gym battle, her Magnemite fell quickly to Pikachu, but her Steelix overpowered Pikachu only to be defeated by Cyndaquil's Flamethrower, granting Ash the Mineral Badge. Her combat style merges defensive and offensive tactics, a hallmark of her Steel-type focus. She mentors an apprentice, Janina, dismissing her for applying waterproof wax to an Onix but reinstating her after observing genuine growth. Later, Jasmine appears in Sunyshore City, Sinnoh, seeking new experiences through Pokémon Contests. She confronts Elite Four member Flint, fielding Steelix against his Infernape. Despite the type disadvantage and loss, she gains insight from Flint's strategy of keenly observing opponent moves. During this encounter, she advises Dawn to carve her own path when facing uncertainty. These events solidify her resolve before she returns to her Gym duties. Her character extends to other media, such as Pokémon Masters EX, where she partners with Whitney in a holiday event featuring Ampharos, reinforcing their bond beyond the core series. Throughout all portrayals, she maintains a reserved yet kindhearted nature, prioritizing Pokémon welfare while evolving from a dedicated Gym Leader to exploring broader pursuits like contests and mentorship. An associate at Olivine Lighthouse references her prior specialization in Rock-type Pokémon before shifting to Steel-types.