I have one.

A Mission For A Mage
1v3, Team Battle
Character: Black Mage (Blue Team)
Opponents: PAC-Man x2, Samus (Red Team)
Stage: NO Items, Sector Z
CPU Level: Lvl 1 (PAC-Men), Lvl 4 (Samus)

Black Mage has been tasked to polish up Sector Z. However, a certain bounty hunter tasked to find him won't allow him to do so...

I managed to beat it, but it did take a while.

Link: https://www.youtube.com/watch?v=RjkPC7QSQ

*uses revive spell on a dead thread*

Anyway, I've came up with a unique challenge.
Unique cuz it involves event match.

True Pacifist

Clear Event 51 : ?????? while being a complete pacifist.

Rules:
- Use any character
- Don't attack. At all.
- Don't use the fireworks either.
- Using special moves to recover is fine as long as you didn't damage the hands (or the fireworks) while recovering. If that happens, it's a fail.
- Basically, let the hands do their thing and let them trigger the fireworks with their own attacks and get caught by the firework explosion. This is the only way to damage the hands while still being a pacifist.
- Expert Mode: Don't get hit

I did the challenge using... who else? --->

I have a challenge too.

Melee

Character: (Red Team)
Opponents: (Blue Team)
Stage: Final Destination
CPU Level: 9
Stock: 1
For S Rank: Use (Melee's worst)

Oh no why the post be double?

The Smash Nightmares!
Character: Bandana Dee
Opponents: Pikachu, Fox, Meta Knight
Stage: Battlefield
CPU Level: 9
BDee has been ordered to take down Smash's greatest characters to prove himself. Can he manage this nightmare?
S Rank if u use Luigi, Kirby, or Zelda (No Sheik)

I beat Nintendo All-Stars first try with Kirby,but how do I upload an ssfrec. file to youtube?

You can't upload ssfrec's to youtube. You need to record it with bandicam or something.

Seriously? How can I change an ssfrec. to something I can use. I already did most of these.

I don't really know but i think you shouldn't do that. Because ssfrec's are not video files. But you can try it with making a copy of that replay (Copy Paste)

.ssfrec files are just storing information about the match (stage, stocks/time/special modes, characters and inputs) and doesnt actually contain a replay of the match in video form. The game then just accesses the information presented and goes with it, which is also why replays dont work after gameplay changes via patches - the whole thing would be messed up and not replay the original match anymore. All you gotta do is watch the replay itself and record that however, which is really not that hard both to setup and to run at a decent quality.

Thanks.

I have another one. And this one is unique because you can only do it... in 1.2! *lightning strikes*

I Vanquished The Darkness!
Mode: Team Battle
Character: Simon (Red Team)
Opponenents: Bowser, Samus and Mr. Game And Watch (Blue Team)
Stage: Dracula's Castle
Items: NONE
CPU Level: NEIN!
Description: Looks like Dracula sent some new enemies for you to vanquish. Defeat these tough enemies and conquer the darkness!

A Classic Rivalry!
Character:
Description: Best Bowser in a fight on his home turf, but no axe this time! Can you handle it?
Opponent
Stage: Bowser's Castle
Items: Super Mushroom, Fire Flower, Ice Flower, Starman
CPU Level: 9
Stock: 1

Speed Eaters
Selectable Character(s):
Description: Replenish your with to 0% without getting K.O.'d or running out of time! The opposing team will attempt to stop you!
Opponents: The remaining selectable characters that aren't chosen.
Stage: Any, though a stage around the size of Battlefield would be optimal.
Items: Food only (Item Frequency will be "Very High")
CPU Level: 5
Stock: 1

Extra rules:
You cannot attack the opponents
Your start damage must be at 150%
Timer will be set at 6 minutes
All of your opponents will be on the same team