Capcom vs. SNK 2 EO Cheats

To unlock Boss Challenge Mode you have to have both Ulimate Regual and
Shin Akuma unlocked.Then highlight Arcade mode and hold x and
Square.While holding x and square choose Singal, Ratio, or 3 on 3
match, choose your fighter, and your handicapt.Then let go of x and
square and you should be fighting bosses.

After unlocking the Extra Options, go to "Option Mode" at the main menu. Go to "Extra Options", select "Player One Life Gauge Type" and change it to "No Damage". Then, go to "Groove Gauge Type" and change it to "Infinite". After this, start survival mode and defeat all 46 characters without taking damage and your Groove Bar will always be full.

You must win against both of the hidden bosses. After that highlight Arcade Mode & then Press X and Y, and then start.

Hold Start + FP after winning a stage to make your character say an opponent specific quote. Hold Start + FK to make the character talk with a team member.