Grusha is the Gym Leader of Glaseado Gym in the Paldea region from Pokémon Scarlet and Violet, specializing in Ice-type Pokémon. He is renowned as the strongest Gym Leader in Paldea and uses a Cetitan as his partner Pokémon. Before becoming a Gym Leader, Grusha was a professional snowboarder but retired after suffering a serious injury that profoundly affected his personality and outlook on life. He typically maintains a cool demeanor during interactions, but when battles intensify, his suppressed emotions surface and his facial expressions become more animated. Despite his stern appearance, he eventually shows respect for trainers who demonstrate genuine determination and growth, as seen when he acknowledges Liko's strength after she defeats an opponent through her own efforts.