Here's a series of steps:
1.) Give your Pokemon the item for duplication.
2.) Save your game.
3.) Enter Bill's PC
4.) Deposit the chosen Pokemon, holding the item, into an empty box.
5.) Begin switching to another empty box, but turn off the game after the saving text finishes.
6.) Turn the game back on.
You should have both your Pokemon, holding the item, and the duplicated Pokemon, also holding the same item.
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You can't duplicate items in Pokemon. Only if you have the Action Replay or GameShark, then you can.
You can't duplicate items unless you use a gameshark
no
Don't think you can
from what i know, you can't. srry. :) but you might get lucky and find someone. from: flyguy007 Hi this is flyman1111 i think you can duplicate items in Pokemon platinum all you have to do is get a ditto and a Pokemon with thief make sure the Pokemon with thief is holding the item you want to duplicate then you get into a double battle use thief on ditto and ditto will have the item that the Pokemon with thief has =] hope it has helped and worked