You can find one in the Safari Zone, or get one when you first leave Cherrygrove City.
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You can find a female Nidorans in routes 35 and 36.
At The Pokemon Safari In Fuschia City
You can find Nidoran in route 3 (sometimes even Nidorino\Nidorina) and the Safari Zone in Fuchia city.
it appers on route 201 (mass out break)
In the safari zone in Fusia city or on route 3 in the midlle of pewter city and mt-moon but it is really hard to find a nidoran(male) i found a nidoran on route 3 but i killed it so get a Pokemon that will help you