Nemona is a Champion-ranked Pokémon Trainer and serves as a reliable guide for the player. She has an energetic personality, and loves Pokémon battles, which she excels at. However, she's not as good at throwing Poké Balls. She, along with the player, is enrolled in the general studies track of the academy, with her homeroom teacher being Jacq.
Nemona also participates in the Academy Ace Tournament, although she has to manage the admin work when it is held for the first time, she can be battled as a random opponent in subsequent Academy Ace Tournaments.
Nemona uses the starter with a type disadvantage to the one the player chooses. As shown in the game's opening cutscene, she also owns a Combat Breed Paldean Tauros, but she is never seen using it elsewhere. She is also implied to have more Pokémon that are unseen by the player, as she became a Champion prior to her first battle with the player and repeatedly mentions needing to select a perfect team for her battles, and the official website for Pokémon Scarlet and Violet claims that Nemona uses Lechonk and Smoliv, even though she is never seen using either of these Pokémon.
During this battle, both the player's and Nemona's Pokémon are prevented from scoring critical hits.