I've just released a translation patch for the Game Boy Color game Harry Potter 3. so, if for some reason you ever wanted to play this thing with its small amount of text translated into English.. enjoy! if you notice any bugs or anything (except the palette issues mentioned in the readme, which were in the original) let me know.
I tried the game (think it's the right one) with both patches applied. The game errors out with FCEU & FCEUX, but works with REW12XTS. By the way, another H. P. game I have also errors with the FCE emu's.