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You can find Nidoran in route 3 (sometimes even Nidorino\Nidorina) and the Safari Zone in Fuchia city.
Only On FireRed LeafGreen.
To obtain a Nidoran (both male and female) in Pokemon Diamond and Pearl, you must use the PokeRadar in the grass of Route 201. It will take a while to find the two Pokemon (the female Nidoran is harder to find in Pearl and the male Nidoran is harder to find in Diamond), and they have a maximum level of three. Of course, you could always migrate the Nidoran to te Pal Park from Pokemon FireRed or LeafGreen. YOU COULD ALSO JUST PUT A NIDOKING/QUEEN IN THE DAYCARE WITH A DITTO AND WAHLA YOUVE GOT AN EGG! ACTUALLY A NIDOQUEEN CANT BREED
You can't get nidoran in emerald only in firered and leafgreen.
You can catch her on route 103, really rare though so look hard! :)