I used GPT-6 Astra and the recent Melee decomp project (https://github.com/doldecomp/melee) to make an online battle royale mod. 100 players in a box, in stamina mode. The last player alive wins.
You will need a good ping/wired internet to run this properly. It works with some controllers out of the box (Xbox for example), but I'm working on figuring out Gamecube controllers.