You don't need two swords OR Orlandu. All you need is a character that can equip a shield and the type of weapon that you wanna duplicate. Sound confusing? GOOD!

Okay, equip all the "best" equipment. Which means you should use a male (so no bags) Put a shield in the top hand and the weapon you wanna dupe(whatever you want, just make sure that the town you are at has that kind of weapon, but nothing any more powerful than it.), Your highest HP armor. and the Bracer. Now enter the shop. (Gariland is a great place) Choose Fitting room. Choose to fit the shield in the top hand and choose any weapon. The choose best fit. If you item was the "best" available, it should be re-equipped and you will still have one in your inventory. So you can duplicate ANY weapon as well as Shields... just do the exact same but the oposite. lol... You can figure it out.

However, this is CHEATING!!!! It is highly dishonorable and you prolly don't care, do you? lol... I never do it... I just consult my ninja friends in HORROR.