Where to find Bruxish in Sun, Moon, Ultra Sun & Ultra Moon

Super Rod: Route 13 (5%), Route 14 (5%), Route 15 (5%) + 2 more
SOS Encounter: Route 13, Route 14, Route 15 + 1 more
Surf: Route 14 (35%), Route 15 (35%), Tapu Village (35%)

Bruxish also appears in

How to get Bruxish in Sun, Moon, Ultra Sun & Ultra Moon

Its base catch rate is 80 out of 255 (higher is easier); the catch rate calculator works out your odds with each ball. For the look, the best colour match is Heal Ball.

Bruxish in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)