Dude, I found out how to make a K.O. factory. So here is the basic idea:
Two large conveyor belts going to the left at the top of the stage, with two going to the right under those, leading to nothing, and a small platform right to the right of the bottom conveyor belts, like so:
_<_<_<_
_>_>_>_ _
Then you have lucario stand on the small platform on the bottom right, and have four other players as bowser, use lucarios b move, just keep holding it, the bowsers come down and hit it, then fall, counting as a K.O.