You can clone any Pokemon using Powersaves, Action Replay, glitches, save dongles, etc. If you have the way to clone, feel free to do so for your shop.
If you don't have a way to clone, ask an official cloner. They've proven themselves to be consistently trustworthy. You may choose to ask anyone else to clone a Pokemon for you, but understand how you potentially run the risk of being scammed out of your Pokemon.
You may trade any OT, but you may only give away for free something with your OT/obtaining or with the original owner's permission. Hope that clears it up.