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While not truly “dedicated” to Pico-8, it’s the best I’ve seen:

https://www.clockworkpi.com/gameshell

I tried my old retromini (RS90, I think) with (the surprisingly still updated) retroarch, but the core seem to crash when loading content.

And I don't want to figure out how to compile the stand-alone emulator (retro8) for it.

Check out the RG351M or any of the other ANERBNIC devices.

https://retrododo.com/rg351m/

I agree! I’ve got a GBA, PSP, DS Lite and a PS Vita. Are there any pico-8 emulators out there for these platforms?

This emulator apparently has builds for the Vita, though it looks like it doesn't support the carts that rely on the latest pico-8 features (this is a common issue with pico-8 emulators).

https://github.com/jtothebell/fake-08