Capcom Vs. SNK 2 Cheats, Codes & Guides

You have to beat the game on default difficulty, in Ratio mode. After you beat the game it will show that you have him.
Get Extra Option
Simply beat the boss challenge mode in the extra options you can choose to inf life, auto guard, inf groove gauge and other cool stuff for both 1 player and 2 player modes
Hidden Bosses:
Hidden Bosses can be used once they have been defeated. The conditions of the Bosses to appear are to fulfill two out of the following three conditions. If you play with a Capcom groove you will get God Rugal, and if you play with a SNK groove you will get Shin Gouki.
Special Victory quotes
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.
Fight The Middle Boss
The middle Boss appears when the all of the following conditions are fulfilled:
No time over has occurred.
The CPU has not made over six "first attacks".
The CPU has not made three or more Special KOs.
Getting a Finest KO
Beat up your opponent until his/her life is low enough to finish them off with a special KO. Stand near your opponent and wait for them to taunt you. Then, do the special move and you will get a finest KO.Or counter your opponents special move with your own to kill him and you will a get a finest KO.
Unlocking Custom Grooves
The Custom Groove option appears once a normal Boss has been defeated (normal Gouki or Rugal). Normal Bosses appear by fulfilling two of the four following conditions.
Achieve over 1000 GPS by the end of the game.
Achieve four or more special KOs.
Middle Boss has appeared.
Achieve two or more LV3 super combo KOs.
Boss Challenge Mode
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.
Unlocking Hidden Bosses
Hidden Bosses can be used once they have been defeated. The conditions of the Bosses to appear are to fulfill two out of the following three conditions. If you play with a Capcom groove you will get God Rugal, and if you play with a SNK groove you will get Shin Gouki.
Achieve over 1500 GPS by the end of the game.
Defeat the Middle Boss (Geese or Bison/Vega).
Achieve at least one Finest KO.