>>28499876So I checked Bruxish's page on the Sun and Moon site, and it seems to be a perfect counter to Sundoge. Water type, with an ability that halts priority moves.
"Bruxish can have the new Ability Dazzling, which no other Pokémon has ever had. The Dazzling Ability prevents opponents from using priority moves that normally strike first"
Sound like you can't use a priority move at all when sheriff Bruxish is in town.