Suppressors are legal to hunt any game animal in CO.
MG's are legal for all small game except of course those restricted to shotguns.

As far as yotes I have hunted them at night with DOW blessing. I had to go to the DOW office in the area I was hunting and get a permit. This was a few years ago and things might have changed but it was perfectly legal. We could use ANY method we wanted to take them. I will call DOW to see if things have changed.