Tailow is usually in the petalburg woods. Or the grass just outside Petalburg woods.
They're common on Routes 104, 115 and 116 and in Petalburg Woods
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Taillow isn't in Leaf Green, just emerald Sapphire and ruby
Taillow is a 3rd Generation Pokemon or a Hoenn region exclusive Pokemon meaning that Firered version which takes place in the Kanto region cannot capture it. All 3rd Generation Pokemon must be traded to Firered from either Ruby, Sapphire or Emerald.
First you have to beat the elite four, then you have to go to island one and talk to Celio, he'll send you on a quest to get an item for him called Ruby, it's in Mt.Ember, then you have to get another one called saphire and give it to celio, after that you'll be able to trade pokemon from emerald, ruby and saphire. Then you trade yourself a taillow.
In the game Pokemon ruby destiny
breed a swellow and ditto