You can unlock all monsters in the vms up to 44 of them by going to the VS Battle, selecting the third choice (bottom one). Once in this screen, hold x and y buttons, then press down on the d-pad and press the trigger buttons at the same time. This individually unlocks each monster up to 44. However, when you go to the Stadium Battle, the vms only tends to hold the first 8 to 10 monsters. This must be repeated every time the game is turned off.
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Play as Godzilla 1st
At the monster selection screen, hold L + R and press any button. Alternatively, beat the game with the basic Godzilla.
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Play as Godzilla USA
At the monster selection screen, hold L + R and press any button four times. Alternatively, beat the game with Godzilla 1st.
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Play as Mech Godzilla
At the monster selection screen, hold L + R and press any button two times.
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Play as Beta Godzilla
At the monster selection screen, hold L + R and press any button three times.
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Play as Minilla
At the monster selection screen, hold L + R and press any button five times. Alternatively, beat the game with Godzilla USA.
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Play as Dr. Serizawa
At the monster selection screen, hold L + R and press any button six times. Alternatively, beat the game with Minilla.
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All VMU monsters
Enter the "VS Battle" menu and select the bottom option on that screen. Then at 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.
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Bonus Monsters
You can access these hidden monsters by completing 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
