Pokémon games didn't offer players the ability to play as a female character until Crystal, but concept art indicates that a female option was planned to be in the original games at one point. As such, a dedicated fan has released a patch that adds the option to either Pokémon Red or Pokémon Blue. Once the patch is applied, you'll be playing as a trainer based off of Green from the Pokémon manga series Pokémon Adventures. You can check out footage by clicking above, and you can download the patch right here.

Source: Kotaku