SOS Encounter: Ten Carat Hill, Route 1 (Only in Ultra Sun & Ultra Moon)
Walk: Ten Carat Hill (20%), Route 1 (20%, Only in Ultra Sun & Ultra Moon)
Its base catch rate is 190 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 Safari Ball or Nest Ball.
Evolution: Rockruff → Lycanroc (Level 25).
Rockruff in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)