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

SOS Encounter: Seafolk Village
Super Rod: Seafolk Village (5%)
Surf: Seafolk Village (35%)

Dhelmise also appears in

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

Its base catch rate is 25 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, Ultra Ball or Friend Ball.

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