SOS Encounter: Poni Plains
Walk: Poni Plains (30%)
Static Encounter: Hau'oli City (After Olivia’s trial, Only in Ultra Sun & Ultra Moon)
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 Ultra Ball.
Evolution: Drowzee → Hypno (Level 26).
Hypno in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)