Alternate Costumes At the Character Selection Screen, highlight a fighter. Then press B or R.
In-Game Reset During gameplay, press Select + Start.
Unlock Akuma Get 5000 Vs. Points.
Unlock Gallery Mode Get 8000 Vs. Points.

OR
With a Skill Setting of 8, complete the game. Then, at the Main Menu, press R.
Unlock Super Akuma Get 9999 Vs. Points.

Gameshark Codes 

Must Be On [M] 597C00706F70FFF5   5B5AEC7D5FD0568C
P1 Infinite Health A2095599AE9ECA0A   30525CEBD2D5C5FC
P1 No Health DE4D4DD09C580B54   3EFB8806CB0FB254
Infinite Time 82E1617EBCC17703 
P2 Infinite Health FD301B60B0FF3506   8F9F84E3358E02A3
P2 No Health 70EF7B094DE958A0   5C1BA54FA1A1A89A
P1 Max Super Meter 982AEEF8D3BBE27B 
P1 No Super Meter 314987E4AC8614AF 
P2 No Super Meter E4FE34D9BBCA449C 
P2 Max Super Meter A69F18887075B6A8 
P1 1 Win Needed 89A16CADA1DF4AF4 
P1 Never Win FDD8BB6A1FED1150 
P2 Never Win CDD9985F2FB3D0AA 
P2 1 Win Needed B77E38FCFCEAAC76 
Unlock Everything 0316927D82132314   6390331D3EDFC186
P1 Instant Win Do not use this code with the Infinite Time, P2 No Health, or P1 1 Win Needed codes. 
70EF7B094DE958A0   5C1BA54FA1A1A89A      FA68E9A5F97AC51B   89A16CADA1DF4AF4
P1 Max Score 
9FA56AAB9239CF6E   54249F346DDB0A8A   E0C4C17A28CA4CDC