Where to find Ditto in Sun, Moon, Ultra Sun & Ultra Moon

Static Encounter: Route 9 (Only in Ultra Sun & Ultra Moon), Konikoni City (Only in Ultra Sun & Ultra Moon)
SOS Encounter: Mount Hokulani
Walk: Mount Hokulani (10%)

Ditto also appears in

How to get Ditto in Sun, Moon, Ultra Sun & Ultra Moon

Its base catch rate is 35 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, Dream Ball or Love Ball.

Ditto in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)