Not a complete answer, but this is my own question and I’m okay with it.
I started testing this a few minutes ago and I immediately noticed a few things.
100% of 10 Leafeon encounters were Female.
100% of 5 Umbreon encounters were Male.
Of course, this wasn’t enough to prove anything, but this makes me think: what if there’s different gender ratios per Eeveelution for Lake of Outrage encounters?
I caught a few Leafeon to see if their stats are the same, which would explain the consistent gender ratio. Unfortunately, they were, which made my observations above invalid.
I changed the date to January 9th, 2021 (my birthday), and I’m soft resetting every encounter, along with changing the date. So far, I’ve had 14 encounters. Here are the results.
6 Eevees were Girls.
8 Eevees were Boys.
That’s about ~42.8% of the Eevees, out of 14, being girls.
The Eevees that were girls so far have been Leafeon x2, Vaporeon, Glaceon x2, and Jolteon.
The boys have been Umbreon x2, Sylveon x2, Flareon x2, Leafeon, and Espeon.
I still don’t think this is enough to conclude anything, but I’m going to keep going. As of now, I do think my Eeveelution = individual gender ratios is a possibility.
After 33 encounters, without getting into all the different Eevees, my total was 13 Females out of 33, now I’m not the best at math, so please feel free to correct me if this percentage is wrong, but this left me with a whopping 39.39%. Much higher than the ~12% am I right?
As of 45 encounters, 20 of them have been female, giving me a 44.44% of finding a female. The pattern of the ~40% seems to be a trend so far.
I plan on going to 100 encounters total before giving my final results on this. Alongside my final results, I’ll also give the gender ratio per Eeveelution. But for now, I’ll leave this at that, as it’s time for me to rest.