>>21159705I'm not saying it's not OU Material I'm just saying it's not going to be some God like everyone is speculating.
Let's say Physical M-Altaria's use became too prevalent in OU, everyone would start running things like Bold Sylveon with slight SpAtk investment to counter it.
>252+ Atk Pixilate Altaria Return vs. 136 HP / 252+ Def Sylveon: 211-250 (57.8 - 68.4%)>120 SpA Pixilate Sylveon Hyper Voice vs. 0 HP / 0 SpD Altaria: 294-348 (101 - 119.5%) -- guaranteed OHKOAnd even in the case of a Special M-Altaria:
>252+ SpA Pixilate Altaria Hyper Voice vs. 136 HP / 0 SpD Sylveon: 159-187 (43.5 - 51.2%) -- guaranteed 3HKO after Leftovers recoveryMind you these calculations are once again with the over estimate of 120 offenses. Not to mention it doesn't have any access to a reliable SpAtk. increasing move. Also god forbid it's defenses or speed get's reduced.
In the end it seems M-Altaria's optimal offensive set would be a physcial one with Dragon Dance. Or possibly the role of a cleric. The reason being it will need to have to set up to stand a chance and out speed M-Gardevoir.