if its a small dent in a region which was relatively flat,
give it a try. what's the worst that could happen. if
that doesn't work, or if the dent is in a region with
significant curvature or on a crease, i think its gonna
require pulling / filling.
The chances of a paintless dent puller working on that are slim to none (& slim just left town!!). You'll need to pull that dent out & as soon as a torch gets on the tank, you'll have to paint the whole thing. Try to live with it until you can be without the bike for a few weeks. In the mean time, start dreaming up cool paint schemes.
I had a tank at the painter and he reached in with a tool he had made and popped out the dent on the side where the knee had hit, so it is possible. Most Monster dents are at the front when handlebar switch gear smack it, those are not likely to come out.