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

Static Encounter: Ten Carat Hill (Only in Sun & Moon), Mount Lanakila (Only in Ultra Sun & Ultra Moon)
Walk: Ten Carat Hill (100%, All Ultra Beasts caught, After Looker’s quest, Only in Sun & Moon)

• Mount Lanakila — Static Encounter
• Ten Carat Hill — Static Encounter, Walk

Necrozma also appears in

• Necrozma location in Scarlet & Violet
• Necrozma location in Sword & Shield

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

Its base catch rate is 3 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 Luxury Ball or Beast Ball.

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