Using the Masterball. But, I wouldn't recommend that. There are other Pokémon that you would be better off using the Masterball on.
The usual stragety is to slowly knock away its HP down to the red zone, and then give it a status problem. Most common is Sleep, because that way Zapdos won't be able to attack until it wakes up, but Paralysis works just as well. After that, just keep throwing Ultraballs (for a better catch rate) and just hope for the best.
You can capture Moltres at Mt. Ember Peak and Zapdos in the Power Plant in FireRed.
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There is only one Zapdos, Articuno, and Moltres in Fire Red.
You can capture Zapdos from the Powerplant. You will need Surf, And you need to go to Route 9 from Cerulean City, All the way to the PokeCenter. Above the Center, there is some Water where you can Surf down to the Powerplant. Just sole the Labyrinth, and get Zapdos! Remember to save in front of it! ^^
Articuno, Moltres, Zapdos, Mewtwo, Suicune, Raikou, and Entei. C Dawg
You can capture Moltres at Mt. Ember Peak and Zapdos in the Power Plant in FireRed.
You can capture Mewtwo in Cerulean Cave B1, Zapdos in the Power Plant, Articuno in Seafoam Islands B4, and Moltres at Mt. Ember Peak in FireRed.
you can't capture it in soulsilver but you can trade it from pearl,diamond,or platinum
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You can't get Zapdos on Pokemon Pearl or Diamond but you can migrate it from Pokemon LeafGreen or Pokemon FireRed.
In the power plant(Zapdos is hard to find but its is there).
You have to trade it from Firered/Leafgreen in Pokemon firered/leafgreen you can find zapdos in power plant, but you need surf to get there.
No you must migrate zapdos from leafgreen or firered then capture it in pal park (NOTE:You must beat the Pokemon league before you can get acces to pal park.)
You get him where zapdos is (power plant)
yes at the place where you get zapdos
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There is only one Zapdos, Articuno, and Moltres in Fire Red.