PKHeX 2022.05.08

[raynelogens]

When editing Red/Blue saves I cannot change the gender. I know in game there are no genders for Gen 1. But when I hover the little pixel icon of them it displays their name and intended gender when traded up. I want to set their gender before I trade them into Gen II or using the PokeTransfer for Gen VII or VIII.

[BlackShark]

The gender of Pokemon from Gen 1 & 2 is based on the Pokemons Attack IV and its gender ratio.

Find your Pokemons gender ratio https://bulbapedia.bulbagarden.net/wiki/List_of_Pokémon_by_gender_ratio
Then check the table over here to see what the IVs should look like to get the gender you want https://bulbapedia.bulbagarden.net/wiki/Individual_values#Gender.

For example Growlithe has a ratio of 1:3 (25% female, 75% male). So an Attack IV of 0 - 3 would result in a female while an IV of 4 - 15 would result in a male.