As a young child, Elesa decided she wanted to specialize in electric-type Pokémon. She encountered Thundurus on Route 7, near her grandmother's house, and became fascinated with it. At some point she attempted to capture it but failed, as she could never find it again.
HistoryElesa appears in the Xtrasceiver conference call between White, the director, and the mayor. She is sitting in the same room as the mayor, along with the city council. Elesa doesn't express an opinion about Pokémon Musicals, but she is exasperated by the council, who hemmed and hawwed when it came to planning the Pokémon Musical and ended up dumping everything onto White's (glad) shoulders, impressed by her capability and her sound plans and ideas.
Elesa meets Black at the Pokémon Musical building, who is wandering while White arranges and prepares things for the musical. She is interested when she hears Black refer to White as "president" and tells him how impressed she is with White. She tells Black that his Pokémon gym battle with her will have to wait until after the Musical (which is in a few days).
When Black arrives at her gym, Elesa shows him how to operate the roller coaster system and then goes to the battlefield to wait for him. However, his safety was jammed, trapping him in the roller coaster car. Elesa is going to put off the battle, but Black insists on holding it like this. They have a 2 on 2 battle, beginning with Black's Galvantula and Elesa's Zebstrika. Zebstrika defeats Galvantula because Motor Drive renders electric-type attacks useless.
Elesa's Volt Switch strategy is very effective against Black's Pignite, until Bulldoze knocks out Zebstrika. Elesa then uses Emolga's flying-type skills to stay out of Pignite's reach and asks Black if he is going to use his Munna to help him come up with a strategy. She seems almost offended when he refuses, but is mollified when he explains that he is the "coach" of his team and he couldn't depend on his Pokémon to get them out of trouble. Emolga is defeated when Black utilizes the roller coaster system to enact an aerial attack.
As Elesa gives Black the Bolt Badge, the roller coaster pulls away, taking him outside. When he returns, he is soaked and fried with electricity, and Elesa realizes that he has seen Thundurus, as she had as a child.
Elesa has a tendency to finish people's sentences for them or answer people's questions before they can finish asking them.
Ability: Motor Drive Zebstrika is the first Pokémon that Elesa is known to own. Zebstrika was first seen as a drawing when Black was reading a book while deciding on strategies to defeat Elesa in their upcoming gym battle. Later, it was seen in person along with Elesa's other Pokémon while it was seen being dressed up in preparation of the Pokémon Musical. Zebstrika was used against Black in the gym battle where it defeated his Galvantula after exploiting its Motor Drive ability to raise its speed. Eventually, Zebstrika was defeated by Black's Pignite.
One Emolga was first seen as a drawing when Black was reading a book while deciding on strategies to defeat Elesa in their upcoming gym battle. Later, they were both seen in person along with Elesa and her Zebstrika while she was dressing up her Zebstrika in preparation for the Pokémon Musical. One Emolga was used in the gym battle against Black where it fought his Pignite and was eventually defeated.
Elesa seems impressed by White's capability and creativity, as well as her mind for the concrete details of arranging and planning. She also comments on White's leadership not just with the facts but with the people, her staff, and how White gets along with and motivates them, even inspiring Elesa herself to help out with the Musical. She and White have apparently had personal conversations outside of planning for the Musical, as White tells her all about Black before Elesa meets him. She thinks that White is a good talent manager and producer.
Elesa apparently thinks Black is cool (as she told him), but prioritizes the Musical over Black's gym battle.