1. On the BIOS screen, tap UP+B after the Nintendo logo appears, but before the Game Boy logo does.
2. Standard buffer
3. Walk around in the grass for ~8s

This Nidoran has above average stats in everything except defense, which is 1 DV Kappa.

DVs are 15/11/1/11/13

I actually had to edit the title, because this Nido was different from what I initially got. Tested this on a GBA, and it works!