263.Golbat
Golbat gets a lot of undeserved hate due to it's encounter frequency and it's friendship evolution, but it's really not that bad. Plus come on, dat ridiculous RBY sprite...
It's design is kind of generic (pretty much literally what you would expect from a vampire bat that's blue), but it's not quite as generic as some normal types and not as ugly as Swoobat. It always kind of bugged me that Brock used a Zu/Gol/Crobat, though it makes more sense than Vulpix at least (it's not a rock, but at least it's in caves, I guess). It bugged me more that Agatha used one though, they should have just said she was a poison type trainer or something.
Golbat was last FE in Gen. 1, so I doubt it ever saw much competitive use since it was weak to the R/B/Y Gods that were Psychic types. I suppose in a way it was FE in FR/LG since it couldn't evolve until post E4, but that's grasping at straws, so I'll wait until Crobat pops up to talk about battle.
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http://pixel.nymag.com/imgs/daily/vulture/2012/06/22/22_abed.o.jpeg/a_560x0.jpg