So why exactly is there people saying Dragon’s Maw Feraligatr would be “bad”?
I can’t think of anything that would stop a boosted outrage except max hp/def steel type and a fairy
+2 252 Atk Dragon's Maw Feraligatr-Mega Outrage vs. 252 HP / 8 Def Steelix-Mega: 162-192 (45.7 - 54.2%) -- 51.6% chance to 2HKO

+2 252 Atk Dragon's Maw Feraligatr-Mega Outrage vs. 252 HP / 252+ Def Unaware Dondozo: 225-265 (44.6 - 52.5%) -- guaranteed 3HKO after Leftovers recovery

I can’t see fairies walling stab liquidation either not that it would be wise keeping him in on one, even unaware clefable has issues
+2 252 Atk Feraligatr-Mega Liquidation vs. 252 HP / 252+ Def Unaware Clefable: 144-169 (36.5 - 42.8%) -- guaranteed 3HKO

This is all Jolly, I could run him adamant too and just go for the tailwind support.