Some people say the reason the starters and Eevee have that ratio is to make it harder to breed them, but as someone who has no interest in the breeding feature and has never used it, I don't know how much if any sense that makes.
After 2 tries right after when I was complaining about finding a female Popplio, I finally got a female Popplio! And it was a mild nature! Felt so elated ^__^
