SOS Encounter: Route 2, Route 3, Melemele Meadow
Walk: Route 3 (30%), Melemele Meadow (30%), Route 2 (20%)
Gift: Poké Pelago (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 Ultra Ball or Level Ball.
Evolution: Cutiefly → Ribombee (Level 25).
Cutiefly in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)