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MEWTWO
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If you want to skip all of the games and go right to the Mewtwo-level
simply hold Z enter this code at the "Trainer Selection"-screen:
B, UP, L, B, A, START, A, UP, R
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S-HARD DIFFICULTY SETTING
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Hold Z and press R, L, A, B at the Difficulty Selection screen.
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SPEED MARATHON
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Hold Z and press B, A, L, L at the Title screen.
Now proceed to the Marathon, at the Speed Selection. You can set the
speed as far as 99.
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UNLOCK ALL TRAINERS IN TWO PLAYER MODE
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Simultaneously hold L + R + Z on both controllers at the Trainer
Selection screen.
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VERY HARD
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To open "V-Hard" (very hard) mode select the game as normal, hold Z
in the first Game Settings screen and tap L, L, A, B.