A Mount’s potential is determined by its grade, and the rarer and stronger the mount, the greater the growth possibilities unlocked through Ascension.
To acquire or change a mount’s potential abilities, you must use Anima Cores, and the higher the mount’s grade, the greater the required amount.
The potential ability options that can be granted to a mount can be checked by selecting [View Stats], and depending on the mount, the granted stats may be fixed.