It's Lunatic Time
For the most part, Zapdos can take a hit as long as the attack isn't boosted in any way.What pokemon and move can OHKO a 4 hp Zapdos?
-Modest Chandelure's Overheat will KO about 60% of the time
-Mamoswine can OHKO with Icicle Crash.
-Glaceon can KO with Blizzard
-Terrakion or Tyranitar can KO with Stone Edge, but Rock Slide is often the better move to have
If items are involved, it's a bit easier. Some of the following can do the job nicely:
-Life Orb / Dragon Gem Draco Meteor from Latios
-Fire Gem Flare Blitz Arcanine
-Normal Gem Explosion Metagross, Azelf, Landorus
-Life Orb / Expert Belt Ice Punch from Weavile