Capcom vs. SNK: Millennium Fight 2000 Hints & Cheats

This code requires access to the NAOMI Game Configuration (operators only). Enter the NAOMI setup using the test button, and then select the Game Test Mode option (scroll down the list with the Service Credit button, select with the Test button). Select the Password option (scroll with the 1P joystick, select with the 1P SHOT1 button)

Insert your coin:

At the Title Screen,
Hold down Light Punch and Hard Punch (Buttons A and B)
then press Start without releasing the 2 buttons.
Keep holding down all the three buttons.
At the character select screen, you'll notice that their is now only one line. All character ratios are equal. You will now have the ability to use two Boss Character or even 2 Evil Ryus or Ioris.

While selecting a character, hold the Start button, and the normal above the character's name should change to EX. This does not work for all players such as characters with a 4-person evil equivalent, and 3-person characters.