I'm training my chocobo to be an all out healer... although I'm curious as to where I buy it armor... I see behemoth armor on chocobos all over the place... not to mention the huge robotic looking armor?

Where can I get these or are they part of the story that I will unlock later...

I talked to my GC but I don't see chocobo armor... someone told me the stables but failed to let me know where that was...