If ever you mess up catching a legendary Pokemon such as zapdos if you saved before that moment you can reset your game and try again and if you didn't the only way to get a zapdos is from another firered or leafgreen or Pokemon xd gale of darkness.
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You can find Zapdos in Power Plant only once so if you let Zapdos fly away or if you defeat it you can never find it again in LeafGreen.
You can only attempt getting Zapdos once but if you save your game before trying to get it and let's say you fail then just reset the game and reopen your file you will be able to fight Zapdos again and retry to capture it.
Yes you can get Zapdos in Pokemon Heart Gold. After you get all 16 badges go to the power plant and Zapdos will be waiting there for you. He is at lvl 50.
go to the powerplant and go all the way to the end of the powerplant maze and zapdos will just be chillin at the end..good luck catching it
If you defeated Zapdos, you can never get him again, unless if you trade from Pokemon LeafGreen or FireRed. If you did defeat him, you should have saved the game before pressing the button, A, on it. That way, if you defeat him, you can just turn off the game and turn it back on and you will find Zapdos still there! ed by: QWERTY