Marvel vs. Capcom Cheat Codes for Dreamcast

Snap Shot
Press START to pause game, then HOLD Y and press X. This will enable you to see the characters and backgrounds clearly without the tinted screen.
Swap Starting Character
Hold all three punch buttons at the Vs. screen to swap who starts match first (i.e. if you chose Ryu then Chun-Li, you would start the match with Chun-Li, and vice versa).

Play as Lilith
At the character selection screen, highlight Zangief, then press Left(2), Down(2), Right(2), Up(2), Down(4), Left(2), Up(4), Right, Left, Down(4), Right(2), Up(4), Left(2), Down(4), Right, Down. Then, Lilith will appear below War Machine.

Play as Roll
At the character selection screen, highlight Zangief, then press Left(2), Down(2), Right(2), Down(2), Left(2), Up, Right, Up(2), Right(2). Then, Roll will appear to the right of Mega Man.

Play as Gold War Machine
At the character selection screen, highlight Zangief, then press Left(2), Down(2), Right(2), Down(2), Left(2), Up(4), Right(2), Left(2), Down(4), Right(2), Up(2), Left(2), Down(2), Right(2), Up(5). Then, Gold War Machine will appear above Zangief.

Play as Shadow Lady
At the character selection screen, highlight Morrigan, then press Up, Right(2), Down(4), Left(2), Up(4), Right(2), Left(2), Down(2), Right(2), Down(2), Left(2), Up(2), Right(2), Up(2), Left(2), Down(5). Then, Shadow Lady will appear below Gambit.

Play as Red Venom
At the character selection screen, highlight Chun-Li, then press Right, Down(4), Left, Up(4), Right(2), Down(2), Left(2), Down(2), Right(2), Up(4), Left(2), Up. Then, Red Venom will appear above Chun Li.

Play as Orange Hulk
At the character selection screen, highlight Chun-Li, then press Right(2), Down(2), Left(2), Right(2), Down(2), Left(2), Up(4), Down(2), Right(2), Up(2), Down(4), Up(4), Left, Up. Then, Orange Hulk will appear above Ryu.

Play as Super War Machine
At the Character Selection screen, highlight Zangief and press Left, Left, Down, Down, Right, Right, Down, Down, Left, Left, Up, Up, Up, Up, Right, Right, Left, Left, Down, Down, Down, Down, Right, Right, Up, Up, Left, Left, Down, Down, Right, Right, Up, Up, Up, Up, Right, Right, Left, Left, Down, Down, Down, Down, Right, Right, Up, Up, Left, Left, Down, Down, Right, Right, Up, Up, Up, Up, Up.

Secret character quick select
There are certain tasks that when completed will unlock the secret characters in arcade mode, without entry of a cheat code. The tasks are listed in the Strategy Guide. If these characters are challenged and defeated, they may be selected by moving the cursor to where they would appear when their cheat code is entered. For example, for Roll highlight Megaman and press Right. This quick select method may be saved to the VMS.

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

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.

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".

Full pause screen
Pause the game, then hold Y and press X.

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: 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

Alternate Ryus
During the a match do the following to have diffen form of Ryu at your disposal. (Level 1 super meter is needed.)
Evil Ryu: Half-circle back Fierce Punch
Ryu as Ken: Half-circle back Medium Punch
Turn Back: Half-circle back Quick Punch

Choose Your Helper
To obtain the helper of you choice, you must always hold down start and then the designated buttons, just before selecting your second character.