Playing as Kirby
Float over your enemy's head by pressing "y","x", or up rapidly. when you're directly above them, press "Z" to do a pinwheel kick down on them, or press the "C" stick down to deliver a barrage of kicks.
Playing as Samus
Face your opponent towards the edge of the stage. Press "Z" to hold on to your opponent with a grappling beam, and press the control stick towards the side of the stage. This will throw your opponent in that direction. Do this multiple times until your opponent is at the very edge of the stage. Then, push the "C" stick towards the edge of the stage to make your opponent go flying off. It works almost every time.
Sandbag Attacks
With Donkey Kong, walk up to the sandbag. DO NOT PICK UP THE BAT!!! Press "Z" and tilt the control stick towards Donkey Kong, and he'll pick the sand bag up. Run to the edge of the platform and off, still carrying the sandbag. With about 3 seconds left, throw the sandbag up. Power up your "B" attack until it's full OR until there's 1 second left, then press "B" again to hit the bag really far.
With yoshi, use A and down over the bag, to deal 30 damage. do this 4 or 5 times, then deliver a smash attack (> A) with the bat to send the sandbag flying.
Playing as Donkey Kong
To set up a power attack with Donkey Kong, use the "B" button and tilt the control stick towards your opponent to use a headbutt attack. This will temporarily make him unable to move. While he can't move, power up your "B" attack. DO NOT LET IT GO IMMEDIATELY!! When your opponent gets up, he'll jump. Wait for him to come back down, and the smack him by pressing "B". If your power-up runs out, try again.
Team Battle
To share lives during a team battle, press start if you die before your teammate. This only works if your teammate has more than one life left.
Hidden Stages
Battlefield - defeat classic mode with everyone
Final Destination - Defeat event match 51
Kirby's Dreamland (N64 Version) - Clear Target Test with all 25 characters
Kongo Jungle (N64 Version) - Finish the 15 - Minute Melee
Yoshi's Island (N64 Version) - Hit the sandbag 1,323 feet or more in the Home Run Contest.
Brinstar Depths - Play 50 vs. matches
Fourside - Play 100 vs. matches
Big Blue - Play 150 vs. matches
Poke Floats - Play 200 vs. matches
Flat Zone - Complete Classic mode with Mr. Game and Watch
Mushroom Kingdom II - Unlock the Birdo or Pidgit trophy.
Hidden Trophies
Battlefield -- Clear All Star Mode
Bunny Hood -- Perform a combined total of 126 combos in Training Mode
Captain Olimar -- Insert a Memory Card with a saved Pikmin file
Celebi -- Find Celebi's Poké Ball in 1P Mode
Crazy Hand -- Clear Adventure Mode on Hard or Very Hard without using a continue
Diskun -- Score points in every Bonus Record category
Donkey Kong Jr -- Collect every Normal Trophy
Entei -- Clear Event Match 26
Falcon Flyer -- Unlock the Big Blue stage (After playing 50 rounds of VS Mode Melee, one of four stages will open at random: Brinstar Depths, Fourside, Big Blue and Poké Floats. Play 200 matches to unlock all four stages).
Female Wire Frame -- KO 101 enemies in the Endless Melee
Fighting Wire Frames -- Survive the 15-Minute Melee
Final Destination -- Clear Event Match 51
Food -- Play 1000 matches in Melee Mode
F-Zero Racers -- Collect every Red Smash Trophy
Kirby Hat Four -- Unlock Jigglypuff, Mewtwo, Luigi, Marth, and Mr. Game & Watch
Kirby Hat Five -- Unlock Ganondorf, Roy, Pichu, Young Link, Dr. Mario, and Falco
Kraid -- Unlock Brinstar Depths stage (After playing 50 rounds of VS Mode Melee, one of four stages will open at random: Brinstar Depths, Fourside, Big Blue and Poké Floats. Play 200 matches to unlock all four stages) Landmaster Tank -- Score a combined total of 1001 KOs
Lon Lon Milk -- Clear the Target Test in 1500 seconds or less
Mach Rider -- Clear Classic Mode in 300 seconds or less
Majora's Mask -- Clear Event Match 47
Male Wire Frame -- Clear the 100-Man melee in 240 seconds or less
Marin -- Unlock the Sound Test (Sound Test is unlocked once you've opened every secret stage and character)
Master Hand -- Clear Classic Mode on Hard or Very Hard without using a continue
Maxim Tomato -- Play 10 matches in Melee Mode
Meowth -- Collect every Blue Smash Trophy
Metal Box -- Perform 11 combos in Training Mode
Mew -- Clear All Star Mode on Hard or Very Hard
Motion Sensor Bomb -- Clear Event Match 3
Mr. Resetti -- KO five people in Cruel Melee Mode
Mute City -- Walk a total distance of 3300 feet or more
Paper Mario -- Hit Sandbag 1476.36 feet or more in Home Run Contest
Samus Starship -- Escape from Brinstar in Adventure Mode
Sandbag -- Hit Sandbag 990 or more feet in Home Run Contest
Sheriff -- Clear Target Test in 750 seconds or less
Smash Coin -- Play Coin Battle Mode 101 times
Sudowoodo -- Unlock Poké Floats stage (After playing 50 rounds of VS Mode Melee, one of four stages will open at random: Brinstar Depths, Fourside, Big Blue and Poké Floats. Play 200 matches to unlock all four stages).
Target -- Clear Target Test with every character
Tom Nook -- Collect 1001 coins
UFO -- Unlock Fourside (After playing 50 rounds of VS Mode Melee, one of four stages will open at random: Brinstar Depths, Fourside, Big Blue and Poké Floats. Play 200 matches to unlock all four stages).
Unown -- Get a combined total of 16404 feet or more in Home Run Contest using any character
Wario -- Clear All Star Mode in 300 seconds or less
Wolfen -- Clear Adventure Mode in 1100 seconds or less
Best Attacks For The Hundred-Man Melee
1. Donkey Kong's "B" and down hand slap
2. Falco's B attack -- stand at the edge of the platform and blast anyone who comes near you.
3. Pikachu or Pichu's "B" and down thunfder - only works on the platforms
however, if you aren't going for KOs, then use this "cheat":
Get Mewtwo. move to the very edge of the stage and face off of it. Charge up his shadow ball and just sit there with it. Everyone will bounce off of it, and noone will be able to hit you. It's a perfect way to win.