Pick D.K. and fight any opponent. Press R and D.K. will grab the enemy. Press R again and D.K. should put your enemy on his head. You will be able to carry your enemy for a few seconds.(With enemy above your head). Quickly walk to the edge of the stage. If you think your opponent will try to get back up press down on the control stick as you fall to fall even faster. You will lose a point for dying, but will gain a point for your opponent's death(if he don't make it back up).

Note: Only D.K. can do this. Also be near the edge of the platform so your enemy has no chance of return.