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.