SOS Encounter: Paniola Town (30%), Poni Gauntlet (30%), Poni Meadow (30%) + 2 more
Its base catch rate is 75 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 Net Ball, Moon Ball or Quick Ball.
Evolution: Barboach → Whiscash (Level 30).
Whiscash in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)