So I have began some research to the best that I can on breeding Nidorans. and the results from breeding them varies. Below, I put down any information need if someone wanted to copy my experiment.
I bred using the parents Nidoran(F) and Nidoran(M). I did NOT skip any eggs; they did come up with the predicted nature/ability from RNG Reporter. I made sure to breed at least 3 of each of the possible gender ratios: M/M/M/M, M/M/M/F, F/M/M/F, F/M/F/F, and F/F/F/F.
Code:
[LEFT]Pokemon Platinum
ID: 30247 SID: 28265
Seed:2F080260 Date: 11/02/2010; 08:09:16
Delay: 598[/LEFT]
[LEFT]Egg Frames: PID: Gender Ratio: Nido's gender: byte from PID that determines gender & dec value: LID and value
1: FA5E697F: M/M/M/F: F: 7F or 127: 697F OR 27007
2: BF24D6BD: M/M/M/F: M: BD or 189: D6BD OR 54973
3: E53F7B46: F/M/M/F: F: 46 or 70: 7B46 OR 31558
4: 1A37BC5A: F/M/M/F: M: 5A or 90: BC5A OR 48218
5: D8C8374C: F/M/M/F: F: 4C or 76: 374C OR 14156
6: FCBD3CFB: M/M/M/M: F: FB or 251: 3CFB OR 15611
7: 01423639: F/M/F/F: F: 39 or 57: 3639 OR 13881
8: 841837D7: M/M/M/M: F: D7 or 215: 37D7 OR 14295
9: 4C1FC31B: F/F/F/F: M: 1B or 27: C31B OR 49947
10: D2B5E813: F/F/F/F: M: 13 or 19: E813 OR 59411
11: 09099A57: F/M/M/F: M: 57 or 87: 9A57 OR 39511
12: 5A455EE0: M/M/M/M: F: E0 or 224: 5EE0 OR 24288
13: 8B10AC06: F/F/F/F: M: 06 or 6: AC06 ORR 44038
14: 83122A1A: F/F/F/F: F: 1A or 26: 2A1A OR 10778
15: B1D690E5: M/M/M/M: M: E5 or 229: 90E5 OR 37093
16: 10D55D53: F/M/M/F: F: 53 or 83: 5D53 OR 23891
17: 80F0DB32: F/M/F/F: M: 32 or 50: DB32 OR 56114[/LEFT]
18: 10C293A1: M/M/M/F: M: A1 or 161: 93A1 OR 37793
At first, I believed that what determines the gender is if the decimal value is divisible by 9; which would give you a Nidoran(M) until I ended up on egg #10 which given me a prime number(with more nidoran(M) eggs that ended up with a different number that isn't divisble by 9). After hatching all 18 eggs, I then looked at the LID to see if it would be something similar to how wurmple is determined to evolved into Silcoon or Cascoon. This also is inconclusive, but it seems that the LID value for the male Nidorans have a greater number than the female nidorans. At least in this experiment.
EDIT: From Serebii's website(I know it's bad to quote from their website half the time, xD) that there's a 50% chance to obtain either gender. So does this mean that there is no way to abuse which gender for the nidorans or fireflies that you want? Is it possible that if you hit the SAME seed that you just might end up with the OTHER gender the second, third, or fourth time?