Elesa is the Gym Leader of Nimbasa City's Gym, known officially as the Nimbasa Gym. She specializes in Electric-type Pokemon. She gives the Bolt Badge to Trainers who defeat her.
Elesa makes her debut in Pokémon Black and White, serving as the Nimbasa City Gym Leader. This Gym is the fourth that the player may challenge. The player can challenge her to a battle after riding a series of roller coasters to her location, a process involving the flipping of multiple switches so the tracks take the player to her.
Elesa specializes in Electric-type Pokemon. She utilises a strategy that involves using Volt Switch between her two Emolga, and later Zebstrika. Upon defeating her, she will reward the player with the a Bolt Badge and TM72 (Volt Switch).
Outside of battle, Elesa is a supermodel. She appears when Bianca attempts to convince her father to allow her to become a Pokemon Trainer. Elesa aids her, convincing Bianca's father to give his daughter the permission to follow her dream. When the player leaves Nimbasa City, it is Elesa who appears briefly on Route 5 and tells the bridge guard to lower the Driftveil Drawbridge so the player may cross it. She then appears at N's Castle, where she and the other Unova Gym Leaders hold off the Seven Sages while the player goes after N. While not strictly relevant to the plot, Elesa also visits Cynthia in the summer at Undella Town.