Only in Ultra Sun & Ultra Moon
SOS Encounter: Seaward Cave
Walk: Seaward Cave (30%)
Its base catch rate is 45 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 Heal Ball or Love Ball.
Evolution: Smoochum → Jynx (Level 30).
Smoochum in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)