I agree with this. Quagsire can't wall Mega Aerodactyl, as it did normal Aerodactyl. Sableye takes close to 75% from DA even after a burn, Mega Venusaur is out of the question, Slowbro is 2HKOed by DA etc.,
A+ Rank ---> S Rank
Mega Aerodactyl is a very dominant force in the current metagame. I've been thinking about nominating this for a few weeks and I really think it's time for this to happen. Mega Aerodactyl is a Pokemon I'm sure most STABmons players are seeing more and more of lately because it's just so good. Tough Claws Dragon Ascent is a godsend and has the ability to 2HKO a large majority of the tier alone. Diamond Storm is an excellent buff as well, and makes Dragon Ascent's drops in Defense not super detrimental. The most common set is probably Diamond Storm / Dragon Ascent / Roost / [Taunt / Coverage] and it fulfills the role of a fast and powerful attacker extremely well. But I think what really pushes Mega Aerodactyl into S Rank is how it has the natural ability to counter Diggersby without much investment, and that's just excellent for an offensive Pokemon. Mega Aerodactyl is dominating the metagame right now, and I think this move should be made to reflect that.
However, Landorus-T and Aegislash wall it to a good extent. That's taken care of with coverage. Ice Fang only 3HKoes Landorus-T, but Taunt it and it can't recover.
Overall, DA's ruthlessness and Taunt's tactical advantage over walls make it an excellent wall breaker.