Blacephalon

Blacephalon is blessed with an outstanding Special Attack stat, which, coupled with its great offensive typing in Fire / Ghost, turns it into a deadly wallbreaker. Blacephalon sets itself apart from other special wallbreakers thanks to its high Speed stat, which lets it act as a late-game cleaner and revenge killer when equipped with a Choice Scarf and outspeed a fair amount of the metagame without a boosting item. On top of that, Blacephalon's Beast Boost ability can boost its Special Attack by one stage after each KO or can be tuned to boost its Speed, further bolstering its late-game cleaning capabilities. However, Blacephalon has an annoying vulnerability to every entry hazard and a weakness to Stealth Rock. It is also weak to common priority moves like Ash-Greninja's Water Shuriken and Mega Mawile's Sucker Punch, which allows these Pokemon to stop a late-game sweep from it and gain momentum by forcing it out. Finally, the presence of Tyranitar as a top-tier threat in the metagame hurts Blacephalon's viability, since it's unable to 2HKO Tyranitar on the switch without prior damage and falls prey to Pursuit.