I don't think I can help you out. I have no idea how I negotiated one from him. Good luck - all I can say is be nice and be persistant. (I do know he wants RNGed DW Eevees... so when the US GL goes live...)
I do, however, think it's hilarious how every single "hard to trade with" (read: "If you can't RNG, step off") RNGer on Smogon is being shot down by this guy! Karma :P
This is why I like trading with you - you're a cool guy, and you sincerely try to trade with others and help other people out. So, once again, good luck!