Uhm, dunno.
Anyway, by my opinion, Zapdos can be bulkier than never, thanks to Lightningrod.
Zapdos can switch on Thunder Wave or any Electric Attack and increase it SpA, thing that is really useful not only for take damage, also.
Normally, Zapdos take normal damage from Electric moves, so an immunity to these moves is very nice, and also is immune to Ground attacks.
Two immunities to two of the most common Types is Awesome.
Anyway, Zapdos also can have the two variations of Hit-n-Run moves, U-turn and Volt Change, and I think that the first is better. Why? well, simple: Volt Changes is locked by Ground-types, and nothing have immunity to Bug moves (except Shedinja).
Well, this set can be useful:
Item: Expert Belt.
Ability: Lightningrod.
Nature: Bold.
- Thunder / Discharge.
- Roost.
- U-turn.
- Hidden Power Fighting, Water or Ice.
This set have an almost perfect coverage, so Zapdos can be a great abuser of Expert Belt.
Thunder is stronger, but Discharge have more PP and better Accuracy, but both have a nice paralysis rate of 30% and STAB.
Combining these with Hidden Power Fighting or Water, you can destroy any non-Dragon-type, killing Skarmory with Discharge and Heatran with HP Fighting or Water.
However, Heatran take normal damage from Zapdos' Electric attacks, so you can run with HP Ice to kill Dragons.
HP Water also can kill Ground- and Fire-types.
Roost is nice, but care off from perfectly predicted Earthquakes.
U-turn is the best escape method of Zapdos, Volt Change is Special and have STAB, but is locked by PKMN with immunity to Electric Moves.
See You.