No you cannot.
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You can not catch it in leafgreen,but in firered you can.
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.
Not any hoenn Pokemon but firered and leafgreen can catch alot of kanto and johto Pokemon ruby and sapphire can and can't.
you cant get toros on leafgreen you need to catch one on firered and trade it to leafgreen
trade from leafgreen