Mega Man X4 Cheats

To play as Dark Mega Man:
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Go to the Character Select screen. Highlight X as your character.
Press O, O, press Left 6 times, hold down L1 and R2, then press
X. You should start off with a somewhat purplish tint to your
armor. Now go to any Dr. Light capsule to receive the super armor.
This lets you do unlimited giga attacks.
To play as Dark Zero:
Go to the Character Select screen. Highlight Zero, then press
and hold R1. Then press right six times. Release R1, press and
hold O, then press X. You should become black zero.