Pokemon Firered Local Multiplayer Simultaneous Quick Tutorial

As stated this is how to do it local, oboviouly it was made to work online but that is more complex and similar to running other games with servers (Minecraft). Anyways, here are the links below
Emulator: https://mgba.io/
Multiplayer Script: https://github.com/TheHunterManX/GBA-PK-multiplayer/releases
Rom(1.0 or 1.1): Get it yourself, its pretty dang easy along with patching it as gone are the days of lunar patching since there all online
Hack: https://www.pokecommunity.com/showthread.php?t=437688