You cant do it in leaf green, only in Emerald....
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That item doesn't exist in leafgreen.
That item doesn't exist in leafgreen.
press it and move it
you can only duplicate items in the game by going through this process: 1) Enter a Double Battle in your game. 2) Send out a Ditto with no item and a Pokemon with the item you want to duplicate. 3) Have Ditto use Transform on the Pokemon with the item. 4) Switch the Pokemon that was stolen from with a Pokemon that can use Thief. 5) Use Thief on your own Ditto. 6) Win the battle. Now the player obviously has two of that item.
No where, as it as Gen 4 item.