Sableye, the Darkness Pokémon. Sableye normally live within caves and eat rocks. They use their sharp claws to dig through the earth.
– May’s Pokedex
Sableye was the first Pokemon with no weaknesses due to its type of Dark/Ghost. Probably due to this, it had a hindering ability in Stall, and its stats aren’t great.
However, in Gen V, Sableye gets the ability Prankster from the Dreamworld, which makes it a lot more usable despite its terrible stats. It can learn many status moves, which become priority moves with Prankster. Moves such as Toxic, Will-o-Wisp, Trick, Taunt, Detect, among others. It can learn Sucker Punch, which will also help balance its low Speed stat.