Quote Originally Posted by Arutan View Post
How do you get 2 rank III abilities? My chocobo is rank 9 full 4* but can't have 2 abilities rank III
Any high-grade chocobo has the chance (fairly slim, but there) of learning a Rank III ability (their "Acquired" ability) at Rank 10, and at every rank thereafter as long as you keep using Lethe to erase the ability they learn. If both parents have a Rank III ability, as well, then their child will have a Rank III "Hereditary" ability.

Hence, two Rank III abilities. Breed from parents with Rank III abilities, and keep erasing your choco's learned skill until it gets a Rank III ability.