Couldn't you sacrifice some speed EVs for some bulk? Even with it's amazing typing, 80/110/110 uninvested doesn't seem brilliant.Disclaimer: I don't think this is an amazing set but it is definitely not used much if at all and has decent use as a late game cleaner which can also weaken stuff early game since it can Roost up.
Altaria @ Altarianite
EVs: 252 SpA / 252 Spe / 4 Def
- Hyper Voice
- Fire Blast
Thanks to its nice typing, Altaria can set up an Agility fairly easily. If you set up late game, not everything has to be in OHKO range because of Altaria's nice bulk, as long as most things are OHKO'd and a select threat or two is 2HKO'd without being able to deal too much back, it can sweep. I do think more power with a Modest Nature would be nice, but I'm running Timid so that I don't get bopped by Bisharp or other Altarias and also so that I can outspeed threats such as Sand Rush Excadrill and Kingdra in their respective weathers after an Agility. My team is kinda weak to Rain and I set up my own sand so that's why I made that choice, but I think Modest could be decent as well.
Neither of these are great matches but they do showcase the power of Agility Altaria. I regret not saving the replay from a PS OU room tournament that I won as that also showed its power although it didn't finish the game for me.
I admit this guy's team was a little weird (LO Talonflame lol) but this was not low ladder. You do see though that a DD Altaria would have failed to sweep because his Keldeo had Icy Wind.
This guy didn't play great but his team was pretty weak to Agility Altaria so I probably would have been able to set up a sweep anyway by sacking something to his Keldeo. Timid Hyper Voice 2HKOs Gyarados if he chooses not to Mega Evolve and he cannot OHKO back so I had it in the bag.
Edit: oh yeah I also regret missing out on a sweep of a Rain Team where I lost a 50/50 otherwise it woulda been epic. :(