If your getting pinch flats, and on a MTB, that means your tires need more air. On my MTB I run them at 55 to 60 psi. And on the road bike I run them at 110 to 120 psi. It makes for a harder ride but it will stop the pinch flats. hope this helps.

Also, it sounds like you ride at night. So get a good bike light that will let you see the potholes way before they eat your tires. LOL