Butterfree can't learn Aerial Ace by level up. It can, however, learn it by TM, which you can find on Route 9.
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it should have learned it already, when it was a pigiotto in fact.
In Pokémon FireRed, the moves that Zapdos can learn through level-up and TMs are Peck, Thundershock, Thunderbolt, Tnunder, Thunder Wave, Agility, Detect, Charge, Drill Peck, Light Screen, Toxic, Roar, Sunny Day, Hidden Power, Hyper Beam, Protect, Rain Dance, Return, Frustration, Double Team, Shock Wave, Aerial Ace, Sandstorm, Facade, Secret Power, Rest and Steel Wing.
The moves that Moltres can learn in Pokémon FireRed would include Wing Attack, Ember, Flamethrower, Fire Blast, Heat Wave, Sky Attack, Firespin, Agility, Endure, Safeguard, Hidden Power, Sunny Day, Roar, Toxic, Return, Frustration, Hyper Beam, Rain Dance, Protect, Double Team, Sandstorm, Facade, Secret Power, Aerial Ace, Steel Wing, Rest and Overheat.
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it would be better to have staraptor because it can learn close combat but for pidgeot maybe aerial ace or something. maybe earthquake lol ._.