Good news guys! Looks like there will be a Pico-8 compatible core coming soon! https://twitter.com/libretro/status/1220373608582778884?s=19

by emulator you mean the linux version of pico8 right? where do I copy it? edit: also there is no es_systems.cfg tried doing a search on my pi on both network and by editing it with nano on the pi itself.