The difference between PokeCheck and getting it direct from me is the gift ribbon that PokeCheck adds to it. People around here would be pissed at you for offerinf something that proves you ripped it off the net. That's not the case with just my Dratini either. I'd highly advise you to not offer Pokes from PokeCheck. They play as legit, but they get an extra ribbon on them they can't usually get. Most people will report you to the blacklist if PokeCheck pokes are offered in a trade on Smogon.