https://wccftech.com/rumor-nintendo-switch-game-boy-advance-emulator-screenshots-leaked/

The official Game Boy Advance emulator for the Nintendo Switch seems to already have been leaked. This emulator will be running on a Nintendo-made emulator known as Sloop which has been shown to run both Game Boy and Game Boy Advance games. This leak took place across several places in 4Chan so... Take it with a grain of salt.

This isn't the first time we heard about a Game Boy-related rumor regarding emulation, mind you. Last year, we reported on the claims from sources that said there were plans about a Game Boy emulator on the Nintendo Switch. Several sources claimed that an announcement was inbound regarding the Game Boy emulator.