The best mobile emulator is for Gameboy-GBc/Gameboy Advance, "Pizza Boy" amazing, you should definitely check it out, the emulation itself is nearly perfect as well : r/emulation
Is there a gameboy color emulator with a similar design to this one here found on ios? : r/androidapps
The Power Of HTML5/Javascript: A GameBoy Color Emulator In Your Browser | TechCrunch
Porting a Gameboy Color Emulator to WebAssembly « Adafruit Industries – Makers, hackers, artists, designers and engineers!