I'm doing most of my practice on my Chromebook laptop, running on GPemu(https://chrome.google.com/webstore/detail/gpemu/jhficiigpnhhaojldmanflihieepanbb), and I was wondering if any of you amazing moderators can say if this is legal, or point me in the direction of a legal one if not. Thanks a lot!

From the rules: "The only allowed emulator is the latest release of GambatteSpeedrun (Currently r717) with a GBC bios image."

You can find that emulator at this link: https://github.com/pokemon-speedrunning/gambatte-speedrun/releases

You also need to find the GBC bios image on google. For some reason, we aren't allowed to link it anywhere.