The Materia Caves
After you've bred some special Chocobos, you can reach the secret Materia Caves scapttered across the world. Each one contains a special Materia you won't find anywhere else in the world. Check the map in the back of the guide for each cave's exact location.
Materia Cave #1 - Knights of the Round
This cave can only be reached with a Gold Chocobo, but once you have the Knights of the Round Materia you'll know why.
Materia Cave #2 - Quadra Magic
You'll need your airship and a Blue Chocobo to reach this cave.
Materia Cave #3 - HP <-> MP
You can reach this cave with a Green or a Blue Chocobo.
Materia Cave #4 - Mimic
Reaching this cave required the use of a Green Chocobo.