Idiot AI on/off
Press R3+L2 to activate, R3+R2 to stop. (The code must be stopped for the referee to count to 3.)
This code makes any CPU players stand in place, not doing anything, allowing you -- the human player -- to beat the crap out of them without defending themselves.
CB2 & GS2v3+ (NTSC)
GS2v3+ (PAL) & Xploder