So...something interesting happened through wonder trade today...
I traded a skill link, jolly, 4 iv Shellder w/ Rock Blast and received a Graveler in return...which didn't evolve. Curiously, it was holding onto an Everstone. Now, through all the stories of accidental trades with Everstones attached I have found here, I thought this guy made a mistake, and I didn't want to be that dick who didn't help him out. But after sending him 3 trading requests, and him refusing each time, I can't help but feel he did it intentionally.

TL;DR: I have an extra Everstone, if anyone is interested! Would like a Metal Coat in return, if possible.