No you cannot duplicate a ditto on Pokemon Diamond because they would be turning into themselves which is virtually impossible because you are already yourself so you would basically be doing nothing.
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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
I'm afraid you cant get a Ditto in Pokemon Sapphire. You can only get ditto in Emerald. However you can also get ditto in Diamond and Pearl.
Im sorry you can't duplicate Pokemon in Pokemon platinum. You can duplicate Pokemon in diamond/Pearl or emerald the trade or migrate them to platinum though.
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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.