Run the game, then hit the left button on the back of your Action Replay (or similar) cartridge and press E before entering the following codes:
POKE 36495,165 (unlock Piston fists)
POKE 36566,165: POKE 36748,165: POKE 36920,165 (unlock Laser fists)
Once you're done, press F3 to restart the game with cheats intact.
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