Wait is there another Chaos I'm missing here?

The only one I know of is the one in Shade Impulse and thats the one that took me forever to kill. It's also the one I think is ridiculosuly hard...

Thanks to Dodie for the Gabranth question! I still don't think it sounds like Basch either but I guess thats just not the way they wanted it...oh well.

I now have another question!

Ok so I unlocked the Fat Chocobo and Black Chocobo cource and I was wondering, what does this change? I put it on black chocobo cource just because I like them but now I wonder if I should change it.
(By the way, lvl 76 Firion PWNS!)