You have to use Pokeballs, Great Balls, Ultra Ballsect.
Many Pokemon can't be caught in Leaf Green, like Mew unless you go to an event, but all events for Leaf Green and Fire Red have ended.
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Not any hoenn Pokemon but firered and leafgreen can catch alot of kanto and johto Pokemon ruby and sapphire can and can't.
you can't catch any hoenn Pokemon in firered or leafgreen you must trade hoenn Pokemon from ruby or sapphire or emerald to leafgreen or firered.
You can not catch it in leafgreen,but in firered you can.
Nowhere no hoenn Pokemon can be captured in leafgreen.
Catch 'em all