She is one of the rival characters in Pok?mon Sword and Shield, the others being Hop and Bede, and specializes in Dark-type Pok?mon. She eventually replaces her older brother Piers as the Gym Leader of her hometown Spikemuth. As the Spikemuth Gym Leader, she gives the Dark Badge to Trainers who defeat her https://bulbapedia.bulbagarden.net/wiki/Marnie non_oc 2024