Mega Man X6 - Platform: Playstation 1

Cheatmode:
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After you press start, before you select new game, input the following code. 
(you will hear a confirmation sound if you do it correctly)

Enable Dark version of the Revived Hunter. 
L1 x 3, R2 x 1 

Enable Ultimate Armour for X
Left x 3, Right x 1 

Cooperative Mode
Highlight Continue, hold Select and press R2 (21), Left, Down, L1, L1, L2, R2, Start 

Use Dark Revived Hunter in Cooperative Mode 
R2 (5), L1 (8), Left, Down, Left, Up, Left, Right, Right, Right, Start 

Hard Mode 
Highlight New Game and press Left, Left, Right, Right, Left, Up, Left, Down, Right, Start 

Nightmare Megaman Zero or X
Highlight New Game and press R2, L1, L2, R1, Left, Down, Right, UP, UP, Left, Down, Select, Start