Golbat

Fugly bat pokemon, evolution of Zubat. Like zubat, it's annoying, especially when you enter caves, appearing every other step, but only in the higher-level caves, like the caves near the sea and Victory Road. Still, they are goddamned irritating, and for some reason, all the bad guys in the Pokemon games love to use Golbat.
Golbat maybe annoying but it sucks. Any strong powered attack will kill it. And even though they suck, they will still emerge to challenge your godlike Pokemon when you trod in caves. God how I hate them. If you want to maintain your sanity, make sure you bring Repels before entering a cave.