I appreciate your help guiding people to solutions, but I think this is a legitimate question for this thread, since at the moment PPRNG doesn't give this information (giant update including this and other missing functionality, speed ups, etc. coming "real soon now"). For someone not steeped in RNG research / abuse, the above explanation doesn't really make any sense. It's not wrong, just very unclear. If you can wait for another week or so (barring unforeseen and not improbable delays) there will be a new version that will tell you what species you will get in the Nidoran M/F and Volbeat/Illumise cases.