Event 42: Trouble King 2
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This event match is somewhat of a sequel to the first Trouble King. However, the player is now Luigi instead of Mario, and Bowser is now extremely large. The player must KO Giant Bowser twice. If he gets even one hit on the player, it will likely be a one-hit KO due to his size.
Due to the combination of Bowser's incredible size and the geometry of Poké Floats, it is more feasible to attempt to cause Bowser to SD rather than trying to KO him directly.