You might want some SpA investment on that set if your calc has 4 SpA...View attachment 79128
EVs: 252 HP/ 252 Def/ 4 spd
- Hidden Power Ice
- Heat Wave/Toxic
If we're talking about the standard set of DDance, Zapdos completely walls it thanks to virtue of its typing, ability, and move set.
Calcs: +1 252 Atk Aerilate Salamence-Mega Double-Edge vs. 252 HP / 252+ Def Zapdos: 80-94 (40.6 - 47.7%) -- guaranteed 3HKO after Leftovers recovery
4 SpA Zapdos Hidden Power Ice vs. 44 HP / 0 SpD Salamence-Mega: 124-148 (70.4 - 84%) -- guaranteed 2HKO
The only way for Salamence to beat Zapdos is Dragon Claw or Outrage, but even with those, it has to worry about Static, which has a 51% chance of paralyzing Salamence and ruining its sweep.