SOS Encounter: Route 1 (15%), Lush Jungle (15%), Route 5
Its base catch rate is 65 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 Nest Ball or Safari Ball.
Evolution: Bonsly → Sudowoodo.
Sudowoodo in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)