Gemma (Pobria Gym Leader)

Gemma (Japanese: によこ Nyoko) is the leader of the Morningvale City Gym. When defeated, she gives out the Jewel Badge. She specializes in Rock-type Pokemon.

In the games
Gemma is rather stuck up, caring only about her fashion and how beautiful her pokemon are. She originally prevents the player from challenging her because of their "lack of fame." After she gets the message that they were the one's who saved the Trevanent on Nightwind Mountain, she then lets you battle her, realizing that it'll make a juicy story on her blog.

In the anime
At first, Gemma does not realize that Madison has become the most popular person in all of the Kalos region, which is considered by many to be the fashion capital of the world. After she realizes this, she is challenged to a gym battle by Madison and loses.