Bonus Monsters: Complete certain monsters all the
way to Tokyo's three stages:
Godzilla-1st. - Beat the game as Godzilla
Godzilla-USA - Beat the game as Godzilla-1st
Minilla - Beat the game as Godzilla-USA
Dr. Serizawa - Beat the game as Minilla
All VMU Monsters: At the VS Battle Menu, select the
bottom option and hold X + Y and press Down + L + R. This
will unlock up to 44 monsters, but less than 10 will appear
in the VMU.