THIS IS FALSE
most likely you can't because I tried every thing I could think of.
Save before you do this.Give a Pokemon the item you want to duplicate then go to a Pokemon centre log on to PC and deposit Pokemon out of party which was holding item then deposit that Pokemon into box 8 (it should be the only one there) Then release that Pokemon (you wont lose it) Then save. When it says saving don't turn off power turn off the power after 5-10 seconds. After that you should have the Pokemon duplicated with two of they same item. Repeat this as many times as you want.
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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
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.
no
You cannot clone Pokemon and items on diamond and pearl and platinum, but you can in emerald!