Event Matches #48, #49 & #50
Event Match #48: Pikachu and Pichu
Character: Whoever you want
Opponents: Pikachu & 2 Pichus
Arena: Dream Land
You get 2 lives and your objective is to KO the 2 Pichus, Pikachu is there to prevent you from doing so and has an infinite amount of lives - meaning you can't get rid of him - so get him out of the way and attack the little electric buggers.
Event Match #49: All-Star Match Deluxe
Character: Whoever you're the best with
Opponents: Dr. Mario, Falco, Pichu, Young Link, Roy & Ganondorf
Arena: Varies
Keep practicing and keep trying, there isn't much I can tell you here, other than you have to be a good fighter!
Event Match #50: Final Destination Match
Character: Whoever you're the best with (I suggest Ganondorf for this one)
Opponents: Master Hand & Crazy Hand (each with 300HP)
Arena: Final Destination
It helps if you know their attacks - they usually have a signal that lets you know what they're about to do so you can dodge it. Also, focus on one hand at a time - once one's gone, it's easy to beat the other. Lastly, use Ganondorf's smash up+A attack - it's the strongest and most effective against the Hands!
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