A little girl in one of the underground paths will ask for a nidoran male if you give her one you will recieve a nidoran female.
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Yes, the female nidoran is blue and male nidoran is purple
You can't get nidoran in emerald only in firered and leafgreen.
Only On FireRed LeafGreen.
Both forms of Nidoran evolve at lv. 16, but you must have a moon stone to get it into a Nidoking or Queen. Hope this helps
It is impossible to catch a male or female nidoran in Pokemon Ruby. To get one you'd have to get it by trade.