Megaman's Repeat Gun Shots

With Megaman only. Hold down the button used to fire megaman's beam gun. If done right megaman will glow. Release the button he will shot more then one this time depending on how long you hold the button.

Select Special Partner

Before the special partner selection screen appears, hold the following buttons for the corresponding special partner:

Unknown Soldier: Hold Start + Weak Punch
Lou: Hold Start + Medium Punch
Arthur: Hold Start + Weak Punch + Medium Punch
Saki: Hold Start + High Punch
Ton-Pooh: Hold Start + Weak Punch + High Punch
Devilot: Hold Start + Medium Punch
Anita: Hold Start + Weak Punch + Medium Punch + High Punch
Pure and Fur: Hold Start + Weak Kick
Michelle Heart: Hold Start + Weak Punch + Weak Kick
Mighty Thor: Hold Start + Weak Kick + Medium Punch
Cyclops: Hold Start + Weak Punch + Weak Kick + Medium Punch
Magneto: Hold Start + Weak Kick + High Punch
Storm: Hold Start + Weak Punch + Weak Kick + High Punch
Jubilee: Hold Start + Weak Kick + Medium Punch + High Punch
Rogue: Hold Start + Weak Punch + Weak Kick + Medium Punch + High Punch
Psylocke: Hold Start + Medium Kick
Juggernaut: Hold Start + Weak Punch + Medium Kick
Iceman: Hold Start + Medium Punch + Medium Kick
Colossus: Hold Start + Weak Punch + Medium Punch + Medium Kick
US Agent: Hold Start + High Punch + Medium Kick
Shadow: Hold Start + Weak Punch + Medium Kick + High Punch
Sentinel: Hold Start + Medium Punch + Medium Kick + High Punch 

Full Pause Screen

Pause the game, then hold Y and press X.

Name Changes

Enter "---" as a name to have the game change it to "SIN". Enter "AAA" as a name to have the game change it to "CAP". Enter "MMM" as a name to have the game change it to "MOT".

Alternate Costumes

At the character selection screen, highlight a fighter, then press A or Y.

Switch Starting Character

Select your characters, then hold Weak Punch + Medium Punch + High Punch at the versus screen. Then when the match begins, the second character you chose will be the starting fighter.

Onslaught's Moves

Sentinel Attack (small form): Any Attack.
Dashing Attack (small form): Down, Down/Forward, Forward + any Kick.
Magnetic Tempest (small form): Down, Down/Forward, Forward + any Punch.
Unblockable Prison (small form): Forward, Down, Down/Forward + any Punch.
Teleport (small form): Down, Down/Back, Back + any Kick.
Magnetic Shockwave (small form): Down, Down/Forward, Forward + 2 Kicks.
Mega Optic Blast (small form): Down, Down/Forward, Forward + 2 Punches.
Hand Crush (large form): Any Punch.
Sentinel Attack (large form): Any Kick.
Hand Drill (large form): Down, Down/Forward, Forward + any Kick (when on the 
ground).
Laser (large form): Down, Down/Forward, Forward + any Punch.
Unblockable Prison (large form): Forward, Down, Down/Forward + any Punch.
Move (large form): Rather than going forward and back like in his small form, he 
now can go up and down in the air.
Laser beam (large form): Down, Down/Forward, Forward + 2 Punches (same as 
the ordinary laser, but he fires five of them).

Play As Onslaught

Unlock all the hidden character quick selects. Then the "Onslaught" option will appear in the game menu.