Get Ultimate Armour for X:
At the character select screen hold down (UP) key and press
ENTER (While selecting X) then go to Web Spider's stage
and go to where the leg Armour is usually placed. You will get
the Ultimate Armour instead. This gives you all
armour modifications with a cool new graphic and the secret
body crash attack which will kill just about anything.
Play as Dark Zero:
Not really a cheat ,just a new graphic - ,just hold
the (DOWN) key while having the selector on Zero to
play as Dark Zero.