You can find a female Nidorans in routes 35 and 36.
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You can catch both male and female Nidoran on Route 35 and Route 36.
It is impossible to catch a male or female nidoran in Pokemon Ruby. To get one you'd have to get it by trade.
Nidoran (Female)- Route 35, Route 36 Safari Zone Nidoran (Male)- Route 35, Route 36 Safari Zone
Yes, the female nidoran is blue and male nidoran is purple
You can catch her on route 103, really rare though so look hard! :)