Level up Amaura to level 39 at night
Ensure it is not holding an Everstone
In Pokémon Sword and Shield, evolve it by leveling up at night
In Pokémon X, Y, Omega Ruby, Alpha Sapphire, Sun, Moon, Ultra Sun, and Ultra Moon, evolve it by leveling up at night
In Pokémon Scarlet and Violet, transfer it from a compatible game and level it up at night if available in the game version you are using