X-Men vs. Street Fighter - Platform: Playstation 1

From: "Jeanette Hill"
Kick Him While He's Down:
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After winning a round, press START and you'll be able to kick or 
taunt your defeated opponent. 

Play as Akuma/Gouki:
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Highlight either Magneto, Juggernaut, Dhalsim or Vega and press UP. 
You will see the face of Akuma. Press any button to use it. 

Play as Apocalypse:
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At the Versus Mode character select screen, hold SELECT on Gouki 
for five seconds, then press any punch button.