+6 252 Atk Parental Bond burned Mega Kangaskhan Return vs. 252 HP / 252+ Def (custom): 283-333 (39.6 - 46.6%) -- guaranteed 3HKO
+6 252 Atk Adaptability burned Mega Lucario Close Combat vs. 252 HP / 252+ Def (custom): 660-778 (92.4 - 108.9%) -- 56.3% chance to OHKO
Custom, being a Blissey except with 135 defense instead. I mean thats just silly. Once the enemy is burned, it doesn't matter how much its boosted, you'd have to hit it with the strongest fighting attack in the game to kill it.
Aggron has no recovery and only 70 base HP, compared to Blissey's 255. That base HP is a huge deal, when you consider that it lets a pokemon with 10 base defense tank any unboosted physical attack thats not close combat or STAB fighting.