Suicidal moves
There are some moves that can cause both players to die. This is useful in a stock battle if you're ahead, or in a time match because you get the kill. With King Dedede and Kirby, simply inhale them and walk off the edge. If you are too high or not close enough to the edge when you inhale them, they will likely escape. However, you can spit them out under the stage where most fighters can't escape.
With bowser, you can use his side special. Remember that you can still move backwards when using it, so you don't need to face the edge. This is unescapable but the disadvantage is this move is harder to pull off because it can't be used in mid-air like the inhale can.
Both of these tactics should count as your kill in timed matches. WARNING: Human players will get mad
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