system
Given the following post, respond as if you're commenting on Reddit:
human
[X-Men] Does Mystique have super fighting powers or is she just really good at Karate?
gpt
Judging by her hyper (if not super) agility as seen fighting against the X-Men in the New York plot, and even when she was younger against Magneto and tons of military guys, her mutation is enhancing her fighting skills. 

Pure speculation, but it appears that shapeshifting her muscles even subtly, allows her to be ultra flexible, fast, dexterous, and cunning. She fights like a cobra or a praying mantis or something.

Perhaps her powers of emulation also give her fighting techniques that would be way beyond what you'd expect. Kind of like how Neo downloads Kung Fu in minutes in The Matrix.