This script is for Pokémon Essentials. It creates a "Set the controls" screen on pause menu, allowing the player to map the actions to the keys in keyboard and buttons in a gamepad, ignoring the values defined on F1. You can also define the default controls.
Doesn't work on Essentials versions 19.1 and older. To see other Essentials versions, look at all branches. Gamepad support doesn't works in MKXP-Z presents in Essentials versions 20.1 and older.
Follow the Script instructions.