X-Men vs. Street Fighter

Fight as Akuma (Gouki):
While at the character selection screen highlight
Magneto, Juggernaut, Dhalsim, or Vega and press Up. 

Fight as Apocalypse:
Select versus mode. Highlight Gouki, hold Select 
for at least five seconds and press any Punch button. 

Fight as Street Fighter Alpha 2 version of Chun Li:
Highlight Chun Li on the character selection screen.
Hold Select for at least five seconds and press any 
button. 

Random Character Selection:
Highlight the bottom left of the character 
selection screen and press Left. Alternatively, 
highlight the right end of the character selection
screen and press Right. 

Continue Attacking:
To continue hitting the defeated character 
immediately press Start after winning a match. 

In-game Reset:
To reset the game hold R1 + L1 + Select + Start.