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You can't duplicate items unless you use a gameshark
You can't duplicate items in Pokemon. Only if you have the Action Replay or GameShark, then you can.
There is no way to duplicate items in Runescape. Although there was a bug once which did allow a person to duplicate party hats, this was quickly fixed.
Mike Hommel (Hamumu) and Seth Robinson created Growtopia.
The name that the game Growtopia was originally supposed to be called was Buildo.