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 defence to 0 and making them utterly useless. 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 Stomp also does the trick, and so does Earth Tremor.