This article is from the Final-Fantasy and other Square Soft Games FAQ, by firstname.lastname@example.org (Nick Zitzmann) with numerous contributions by others.
There are some chocobo stables hidden in various parts of the world.
Although the stables won't always be where you need them, they do pop up
in some semi-convenient locations:
- Nearby Tzen (in the World of Balance) is a forest which sort of looks
like it's in the shape of a chocobo. There's a chocobo stable somewhere
in this forest. (It disappears during the World of Ruin.)
- Nearby Mobliz (in the World of Ruin) is another forest which has a
stable operation. This one's really easy to miss, but if you find it,
it'll make exploration of the Serpent Trench much easier.