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

SOS Encounter: Poni Wilds (15%, Only in Sun & Moon), Route 15 (15%, Only in Ultra Sun & Ultra Moon), Poni Breaker Coast (Only in Ultra Sun & Ultra Moon)
Surf: Poni Wilds (25%, Only in Sun & Moon), Ancient Poni Path (25%, Only in Ultra Sun & Ultra Moon), Poni Breaker Coast (25%, Only in Ultra Sun & Ultra Moon)

Lumineon also appears in

How to get Lumineon in Sun, Moon, 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 Dive Ball, Net Ball or Strange Ball.

Evolution: Finneon → Lumineon (Level 31).

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