I noticed that you accidentally rigged part of the roof of the mouth to the JawN for the updated Mega Charizard X face. Also, the rig for the WingJf bones (again with Mega Charizard X) is awkward.
Hmm.. I didn't even touch the face rig for X.
I'll take a look at it. I'll maybe re-rig him this weekend if I have time.