Duplicating
You have to go into the Pokemon Center, and stop in front of the PC, and save. Then, you put the Pokemon you want to duplicate into the PC, and save , but when it says saving please wait, shut off the power immediatly. Then, turn it back on and check your party and the PC. The Pokemon you tried to duplicate should be in both places.
Have fun duplicating!
(it doesn't always work, but it won't do anything bad to your game)
More tricks, tips and cheats for this game are right here - Pokemon Gold cheats
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