I just got a Jolly Chesnaghut in Ultra-sun with island-scan one ultra ball not a crtical catch just curious ultra-sun island-scan
Usually impish, adamant, or brave is better, but there is a set on the chestnaught moveset page that uses jolly. The first answer on the page. https://pokemondb.net/pokebase/165489/what-is-a-good-moveset-for-chesnaught This is a slightly different set, but same idea. This one also has an analysis of the set http://pokemonforever.com/Thread-SMOGON-UU-Chesnaught-Sweeper