Yes, works exactly as expected! 🎉 My biggest concern being the real time clock and that works exactly as expected too. Even playing ROMhacks like Pokémon Unbound, which is based off FireRed, works.
Running the Games
I've not run into any issues playing gen 3 Pokémon games with the EverDrive GBA Mini. Works just as expected, even the real time clock events. See below for more.
Real Time Clock
The GBA Mini comes with real time clock (RTC) functionality. How else are your berries going to be ready the next day?
Below is a quick time-lapse of 15 minutes showing the real time clock working as expected:
As you can see, the GBA Mini is removed for the ~15 minutes but still keeps up with the current time when we check it afterwards.