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>Mega Altaria
Steelix @ Leftovers / Steelixite
Ability: Sturdy / Sand Force
EVs: 252 HP, 252 Def, 4 SpDef
IVs: 0 speed
Relaxed Nature
- Stealth Rock
- Earthquake
- Dragon Tail
- Gyro Ball
Say what you want about Steelix, I like him. I know he sucks in general nowadays. But for Mega Altaria, at least, he's got a bit of a niche for the common sets.
Mega Altaria commonly run bulky DD sets, and then sweep away with mono-return and Earthquake for coverage. They also run Roost to keep up their health.
Honestly, a lot of sub-UU tier stuff can potentially wall Altaria -- what comes to mind first is Bronzong, Crobat, Weezing, and bulky non-mega Charizard never listen to /vp/, because they all resist Fairy, and are immune to Earthquake. But honestly, I feel so bad for Steelix with that shit mega he got that I want to do it about him, though any of the above work great too.
Mega Altaria cannot OHKO Relaxed Steelix unless it has Fire Blast, but they're not nearly as common on sets as Roost. Otherwise, even with the super-effective Earthquake, it struggles hard to get a solid KO.
Running a Relaxed nature means that, while Altaria boosts with Dwagon Dance, your Gyro Ball only gets stronger, and you can still tank its super effective hits. If they run Fire Blast, well, sorry. If not, take a look at these stats after two DD boosts (imagining we come in as a revenge-kill threat).
0 Atk Mega Steelix Gyro Ball (150 BP) vs. 64 HP / 0 Def Mega Altaria: 360-426 (117.2 - 138.7%) -- guaranteed OHKO
+2 252+ Atk Mega Altaria Earthquake vs. 252 HP / 252+ Def Mega Steelix: 164-194 (46.3 - 54.8%) -- 64.5% chance to 2HKO
[to be continued]