I think Chocalito Gonzales is probably the best pound for pound.. Thing is he only weights a few lbs being a flyweight, so will go largely unrecognised.
I think I've heard that name before, but I just looked him up and yeah... Pound for pound greatest fighter on the planet. Chocalito Gonzales>everyone else thats not fit to lace up his gloves.
Thats pretty sad really isn't it.