in the anime, they replaced amaura with onix
This question is common. Anime and Games are different.
I have a few things that are different:
Valerie having 2 Pokemon in anime instead of 3.
Olympia doing double battles in the anime
Wulfric doesn't have Cryogonal in the Anime.
No lysandre's zygarde thingy in the Game.
Winona doesn't have skarmory.
Norman has Slakoth,vigoroth, and slaking in the anime, instead of a vigoroth and 2 slakings