This is going to sound very similar to something I talked about some time ago, but I assure you, it's totally different.
Totally.
So, you're playing Bad News Baseball and saying to yourself, "Gee, this is great, but I'd like to play with a team of girls rather than a team of guys." And I can understand that. The selection of games featuring women playing competitive sports is, shall we say, lacking.
But!
You totally have the option of changing everyone in Bad News Baseball into women if you perform the following steps:
1. On Controller 1, hold Down + Left
2. On Controller 2, hold Up
3. While holding all of these, turn on your NES (or reset it)
Done right, the mode selection indicator will turn from a baseball
To a heart
And when you start the game, all of the players have female names
And, unlike in Baseball Stars, the players actually look feminine, more or less
At least as much as possible on the limited hardware.