Dark Bristle

The Dark Bristle is a more powerful version of the Bristle fought in Paper Mario: The Thousand-Year Door. Dark Bristles are only found in the Pit of 100 Trials, on levels 81-89.

The Quake Hammer badge is incredibly useful against these enemies. It will flip them over for two turns, dropping their Defense to 0 and making them utterly defenseless. Also, if Mario is wearing the Spike Shield badge, they will not extend their spears to poke him if he readies his hammer. Being stomped with Spike Shield also works, as does the Star Power Earth Tremor.