One Piece - Episodes -629-746- -dressrosa Arc- _best_ -

Episodes 667–673 feature the dwarves failing repeatedly to Sugar. This section drags slightly, but it pays off in a historic moment.

Faced with Doflamingo’s overwhelming "Awakened" string powers, Luffy reveals his most powerful transformation yet: Gear Fourth - Boundman . One Piece - Episodes -629-746- -Dressrosa Arc-