Originally Posted by Fat Solace
Just teach it in the Gen IV game then, to be safe. You don't want to get DQ'd over having it from the BW2 game unless TPCi says that they'll allow BW2 tutor moves to be used.
I suppose you're right. They could probably pull up data on almost everything about our pokemon, including the origination of their items, because it says to not use hacked items.