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

SOS Encounter: Route 14, Route 15, Route 16 + 8 more
Walk: Route 15 (50%), Route 16 (50%), Route 14 (30%) + 6 more
Surf: Route 14 (20%), Route 15 (20%), Poni Wilds (20%, Only in Sun & Moon) + 3 more

Pelipper also appears in

How to get Pelipper in Sun, Moon, 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 Dive Ball or Quick Ball.

Evolution: Wingull → Pelipper (Level 25).

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