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Playstation - Cyberbots: Full Metal Madness cheats

Play as Zero Gouki
Finish the game with the following pilots: Chiyomaru Kaguru, Shade and 
Devilotte. The Super 8, Gaits, Helion and Warlock will be selectable at 
the VA selection screen. Now complete the game with any of the original 
pilots. If done correctly, you will see a message near the ending.
Now go to the VA selection screen to select Gouki. He will be at the 
very bottom of the screen, beneath the Warlock. 

Play as Zero Gouki (methode 2):
Complete the game on any difficulty level, and reach at least 4 stars 
without using a single continues. Then, go to Vs. and arcade modes to 
select him.