SOS Encounter: Hau’oli Cemetery (Only in Sun & Moon), Poni Meadow (Only in Ultra Sun & Ultra Moon)
Walk: Hau’oli Cemetery (30%, Only in Sun & Moon), Poni Meadow (10%, Only in Ultra Sun & Ultra Moon)
Gift: Poké Pelago (Only in Ultra Sun & Ultra Moon)
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 Great Ball, Moon Ball or Dusk Ball.
Evolution: Misdreavus → Mismagius.
Misdreavus in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)