Play as original Godzilla:
Hold L + R and press any button at the monster selection screen. Alternatively,
successfully complete the game once.
Play as Mech Godzilla:
Hold L + R and press any two buttons simultaneously at the monster selection
screen.
Play as Beta Godzilla:
Hold L + R and press any three buttons simultaneously at the monster selection
screen.
Play as American Godzilla:
Hold L + R and press any button four times at the monster selection screen.
Alternatively, successfully complete the game as the original Godzilla.
Play as Minilla:
Successfully complete the game as American Godzilla.
Play as Dr. Serizawa:
Successfully complete the game as Minilla.
All VMU monsters:
Enter the "VS Battle" menu and select the bottom option on that screen. On the
next screen, hold X + Y and press Down + L + R to unlock up to forty-four
monsters. Note: Only less than ten monsters will appear in the VMU.
Sites: