Make a rogue(scout) 4 and monk (any) 8 (I only play to level 12, but you could go as high as you like) so as to utilize greater movement as well as flurry of blows each attack with sneak attack, and pair those with pummeling strike and pummeling charge so as to utilize the scouts charge ability. This allows you, with no magic items, to make 4 flurry attacks at 1d10 each after charging up to 100ft.