I would say Zapdos would be great in your team. Zapdos has great bulk, high special attack and a decent speed stat. With this moveset it's a great threat:
Nature: Calm/Timid/Modest(I personally prefer Calm)
Trait: Pressure /Lightning rod(not released yet)
-Thunderbolt(STAB MOVE and decent power
-Heat Wave (Coverage against Ice, can counter grass, weaken bug,...
-Toxic(To slowly get rid of bulky Pokemon
-Roost(To recover health when toxic stalling a Pokemon
Zapdos is immune to ground, A trait that Electivire misses but weak to ice and rock(It is bulky and would not be as easy to bring down like electivire. I myself used a Zapdos when I was beating the PWT and it really served me well.
Hope it serves you well too and good luck