HM Slave. Well and truly. And once I'd beaten Kanto/The Elite Four/Red, I boxed it because I had a Pidgeot who knew Fly, and taught my Lapras Surf.
...and then I convinced my baby brother that it's "WAY OSSUM U GOTTA HAZ IT" and traded it...for his Mew.
I'm destined for the Ninth Ring of Hell, I know. =D