Chocobo Sage
In the mountains deep within the arctic continent, you'll find a small house with a strange man named Chocobo Sage. He has advice on how to raise the Green, Blue, Black, and Gold Chocobos. You can also pick up an "Enemy Skill" Materia just for stopping by and speaking with his pet Chocobo.
There's also stuff to buy at the Chocobo Sage's house. Here you'll find the coveted Sylkis Greens as well as several other Chocobo related items. Porov Nut 2000; Pram Nut 1500; Sylkis Greens 5000; Reagan Greens 3000.
The Chocobo Sage's house can only be reached by airship or on the back of a Chocobo with mountain crossing abilities. If you have trouble finding it, it's directly west of the Corral Valley Save's west exit.