A few Chocographs provide hints about locations where Choco can dig up a "Power Up." In this case, instead of finding treasures, Choco will fall asleep and go to Chocobo's Dream World for a...
You either go to the East or West gate in Rabanastre and then when you have entered either gates you look to your left. There you will see a stable of Chocobos and talk to the moogle/little cute...
after completing chapter 10 you will go to gran pulse there you will find things called cieth stone once you have completed mission 14 they should appear around the archytle steppe