Just gonna throw some stuff out there.
Cofagrigrigus and Dusclops both get Prankster from Mega Banette. Priority Will-O-Wisp, Pain Split, Memento, and Destiny Bond anyone? And oh yeah, they both get priority Haze, which completely stops set up sweepers. Their insane bulk+Haze+Will-O-Wisp will allow them to check all the dangerous set up sweepers in the tier.
Huge Power has some really good abusers, such as Linoone and Persian. Persian now gets Huge Power boosted Fake Outs, and can use an effective scout set of Fake Out, U-Turn, Knock Off, Return/Taunt. Linoone just goes to town after a Belly Drum boost, as the calcs show. You can easily set up on walls with a sub, and then procede to annhilate them after the boost. Linnone doesn't even need to boost up to be effective; STAB Extreme Speed coming off an effective base 416 attack can easily revenge kill weakened Pokes. I think were all forgetting that with Huge Power, Linoone isn't forced to run Belly Drum to actually do some damage. It can run an effective LO set to punish offensive teams, or a CB set to demolish stall teams. I mean, look at those calcs, this thing is completely broken.
+6 252+ Atk Huge Power Linoone Return vs. 252 HP / 232+ Def Skarmory: 279-328 (83.5 - 98.2%) -- 68.8% chance to OHKO after Stealth Rock
+6 252+ Atk Huge Power Linoone Return vs. 252 HP / 252 Def Mega Aggron: 205-242 (59.5 - 70.3%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Choice Band Huge Power Linoone Return vs. 252 HP / 232+ Def Skarmory: 166-196 (49.7 - 58.6%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
252+ Atk Choice Band Huge Power Linoone Return vs. 252 HP / 252 Def Mega Aggron: 123-144 (35.7 - 41.8%) -- guaranteed 3HKO
252+ Atk Choice Band Huge Power Linoone Return vs. 252 HP / 184+ Def Gliscor: 373-441 (105.3 - 124.5%) -- guaranteed OHKO
252+ Atk Choice Band Huge Power Linoone Return vs. 252 HP / 252+ Def Hippowdon: 372-438 (88.5 - 104.2%) -- 62.5% chance to OHKO after Stealth Rock
252+ Atk Choice Band Huge Power Linoone Return vs. 252 HP / 252+ Def Eviolite Chansey: 766-903 (108.8 - 128.2%) -- guaranteed OHKO
252+ Atk Choice Band Huge Power Linoone Return vs. 252 HP / 252 Def Mega Venusaur: 250-295 (68.6 - 81%) -- guaranteed 2HKO after Stealth Rock