OK. So if you wanna dupe an item you need to get a partner. Next, get the item that you want (that parts pretty obvious.) Then get into trading mode. Trade the item of your choice to your partner and try to lose connection somehow (i would reset the cable modem to lose connection.) that way the game does not have time to save on your computer that you traded the item, though your partner will still have the item. Log back on and you should have the item.
(notes)
-You should have a trusted partner
-you should lose connection as fast as you could after the trade
-Have fun duping!!
