You can't catch Venusaur on Firered, but you can get Venusaur by choosing Bulbasaur as a starter then training it.
You can trade it (from someone who chose it as their starter) or you can use AR or GameShark to catch one. If you know someone who chose one as their starter but don't wanna give it away you can ask them to breed it with a ditto and give (trade) you the egg. It will hatch into a bulbasaur =)
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Trade 1 from another player or migrate a bulbasaur, ivysaur or the venusaur from leafgreen or firered
you do not catch it . you can bulbasaur when you get it from proff oak
You can't 'catch' Venusaur. You can get Bulbasaur from Oak and evolve it twice, or you can do a trade. I know someone who knew how to catch other trainers pokemon, but I don't know how to perform it.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.