It was first used during the match between Inazuma Japan and Muteki no Giant. Endou suddenly faced a new shot from Clario, Diamond Edge, and because of the sudden angle the technique used, Endou had to use something different. Thus he came up with this technique, Diamond Punch, to jump to the shot and powerfully punch it out of bounds.
The user uses Diamond Hand, then dashes from the right side of the goal to the left, with their right hand clutched into a fist. The user then punches the shot using their fist, knocking it away from the goal.