SOS Encounter: Route 8, Wela Volcano Park, Lush Jungle (Only in Ultra Sun & Ultra Moon)
Walk: Wela Volcano Park (30%), Lush Jungle (30%, Only in Ultra Sun & Ultra Moon), Route 8 (20%)
Its base catch rate is 120 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 Luxury Ball or Dusk Ball.
Evolution: Salandit → Salazzle (Level 33).
Salandit in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)