Jasmine

"Thank you for your help at the Lighthouse... But this is different. Please allow me to introduce myself. I'm Jasmine, a Gym Leader. I use the...clang! Steel type! ...Do you know about the Steel type? They are very hard, cold, sharp, and really strong! Um... I'm not lying."-Jasmine, Pokemon HeartGold and SoulSilver.

Jasmine (ミカン Mikan) makes two appearances in Gen. II and Gen. IV. In Gen. II, she is the Gym Leader of Olivine City. Defeating her will give you the Mineral Badge. In Gen. IV, she appears when you reach the beach at Sunyshore City and will give you the HM08 Waterfall.

In addition, if you make it to a Master Rank Pokemon Contests, you will go up against her and her Steelix.

She does amazing in the both the Dress up and Dance categories, but faulters in the performance of moves. Jasmine appears in Diamond, Pearl, and Platinum in Sunnyshore City

In the Anime
In the Anime she was voiced by Tara Sands back in the Johto League Champions and Pokemon Master Quest, and she was voiced by Alyson Leigh Rosenfield in Sinnoh League Victors, much to fans dismay.

In the Manga
She battled Brock in the fight where all Kanto and Johto Gym Leaders fought each other and she won because no one knew there was such a thing as a steel type pokemon, and Brock was suprised that Onix had another evolution that is none other than Steelix. Professor Oak explained that there was a new discovered type called Steel Type.

Pokémon in the Anime
On hand

Trivia

 * Jasmine is the only character to use a starter pokemon from a different region when rematched that doesn't appear pre-national Dex.
 * Jasmine is the only female Johto Gym Leader that admits defeat.
 * Although Jasmine never mentions her age a NPC that you can register as a phone contact in HGSS says that she started using steel type at age 14 when she met Brock after being defeated by a trainer named Red. according to game lore generation 1 and 2 is 3 years apart. This makes Jasmine 17.
 * Jasmine can be seen at Sunyshore City in Pokemon Diamond, Pearl, and Platinum.