Really dude, it's fine. I have an idea though. If I send you a Poliwhirl with King's Rock it will evolve. My suggestion is that you take the Choice Band it carries and then send the evolved Poliwhirl back to me :)
I wanna give you something for it, wouldn't seem fair to me. Do you want any berries? Maybe a meowth? People seem to look for it a lot. Not sure what else I could give you...