Event 51: The Showdown

This Event Match gives you a choice of any character. You'll have 3 stock, and your opponents, Giga Bowser, Ganondorf, and Mewtwo also have 3 stock. You play on Final Destination, which you unlock after clearing this. To get this Event Match, clear the first 50 events.

Jigglypuff
Damage Giga Bowser a little bit, then jump into him and KO him with Rest (Down B). Do that 2 more times, and then try and do the same to Ganondorf and Mewtwo. You can also trying flying around waiting for good items to show up, though Resting is quicker.

Peach
Use your floating skill and parasol to float over their heads waiting for any good items to appear.

Fox/Falco
Go to the edge of the stage and start using the blaster (B) on them to weaken them. When they get near you, Fire Fox/Bird (Up B) or Fox Illusion/Falco Phantasm (Left/Right B) over to the other edge and reapeat. Continue this. Once they're at a considerable damage percentage, attack them with a smash attack.

Fox/Falco 2
Fire Fox/Bird (Up B) all over the place, using it to dodge and recover. It's possible to do a run with no stock loss like this.