I would say Bowser, and then Bowser again. He's an absolute monster (his bair hits for 19% clean just to give an example) and his grab can lead to some serious cheese if you're going for that final kill. It's horizontal travel distance is based on your opponents %, and you can take them over the edge as low as 30% damage. They hit the bottom right before Bowser does, so it's a cheap way to finish off that final stock.
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