How do you beat event matches 47,48,and 49.?

Event 47

You'll want to use a character with strong B button moves. Captain Falcon or Gannondorf are recommended, Jump into the space between the top two
Spikes on the mask. Perform your DOWN and B technique over and over. They will beat you up pretty bad, but you can almost do as much damage to them as they do to you this way. Just keep on doing it. Use B to get up to knock them around some more. Pay attention because eventually you'll get hit too far to get right back in. If the battle ends up over on the edge of the mask with you having to jump back on, Captain Falcon and Gannon have the nice ability that makes them grab people when they perform their
UP and B move. So in the act of trying to get back on the stage, you can can sometimes get the computer in a little bit of a loop! This is a little harder to keep doing, though, so it might be better if you try to get back in the center and start doing what you did at first. Just keep on going with this technique and eventually you should completely KO
Someone and have the others pretty hurt. Once it's calmed down a bit, you could start trying to fight them like normal. In fact, you could fight the entire battle like normal if you wanted, but my strategy is just designed to work pretty well almost all the time. Don't be afraid to reset the level or restart it completely to try and get characters who get knocked off easier. If you're having trouble, try to restart it until you get Pichu and
Jigglypuff or other easy to KO opponents. Event 48

You have to KO the Pichus to win. I am pretty sure that they are set not to get
Thrown off easy. There's really not a whole lot you can do
Here to make it easier. Hope you get some good items, and go for the Pichus only! If you get KOed, use the invincibility period to get a free smash on them. Captain Falcon's smash FORWARD and B punch move can sometimes hit them all a lot without taking damage, but it's not going to KO them, so it's only useful to hurt them a little. Make sure to smash a direction and R if you're getting beat up to much to flip away. Basically, to
Win this battle you'll have to combine solid fighting skill and good item usage. Event 49

If you are having problems here you can try to use DK's forward throw
Move to pick up your opponents and jump in the pit with them. You can also suck
Them in with Kirby. And the jump in the pit. If you do it right you can win the
Fight without losing a life. It is not easy to do to all of them.
Just see what works for you.

Event Match #47: Trophy Tussle 3
Character: Whoever you want
Opponents: 3 Random Characters
Arena: Majora's Mask Trophy
This is the last battle for a Trophy. In the middle is where you should do most of the damage, once you have their percentage up - lure them to an edge of the Arena and send em flying.

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!