Before being the Gym Leader of Glaseado Gym, Grusha used to be a professional snowboarder,[1] and the second best in the world — at one point having won six times in a row at Paldean major competitions. He was forced to retire from the sport after sustaining an injury from an accident. He usually keeps his cool, but will show his hidden emotions in the heat of battle.[1] Because being a Gym Leader is the only thing he has left, he is overly worried about maintaining his position, creating some discomfort around Geeta. After the player defeats him in a rematch during a Gym Inspection, Grusha regains his former determined side, intrigued by the player's skills.
In addition to the Gym Badge, Grusha gives out TM124 (Ice Spinner) after defeating him.
Upon defeating Grusha the third time in the League Club Room, he will trade a Cetoddle to the player in exchange for almost any Pokémon excluding Shiny, Legendary, or Mythical Pokémon.
Grusha was introduced as a Supporter card in the Pokémon Trading Card Game during the English Scarlet & Violet Series (the Japanese Scarlet & Violet Era). It was first released in the Japanese Snow Hazard expansion and the English Paldea Evolved expansion, with artwork by GIDORA. An ultra rare version with artwork by the same artist, and a special illustration rare version of the card with artwork by DOM were released in the same sets. It allows players to draw cards until they have 5 cards in their hand, unless they have no Energy attached to any of their Pokémon; in which case the player draws cards until they have 7 cards in their hand.
Trivia
Grusha's Japanese Gym Leader title is 絶対零度トリック.
Grusha is the first Gym Leader since Blaine in GenerationsII and IV whose Gym is not located in a town or city.
His Altaria's Ice Tera Type may allude to icy clouds in the skies, considering Glaseado Mountain's high altitude.
