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XBox - Marvel vs. Capcom 2 cheats

Easy special for any character:
When your special meter reach three or higher, press L + R

Buy Extra Fighters cheaper:
Exit and re-enter the shop screen until the price of the extra 
fighters are lower.

Change the Time on the Clock in the clock level:
Modify the console's system time.

In-game reset: 
While playing press Start + Select

Change costume colors: 
Press L or R while choosing a character to change the unlocked costume color.

Evil Sakura and Zhangfei: 
Press Down, Down/Left, Left, Back, LK. They will have the same moves plus extra.