Gift: Route 8
You won't find Amaura in the wild in this game — you get it as a gift.
Looking for Aurorus? It isn't found in the wild in this game — evolve Amaura (Level 39).
For the look, the best colour match is Quick Ball, Dive Ball or Beast Ball.
Evolution: Amaura → Aurorus (Level 39).
Amaura in every game · Pokémon Sun, Moon, Ultra Sun & Ultra Moon interactive map (Alola)