I'm playing Game Boy games on a real Game Boy Advance SP, where some of them get color. Adventure Island or Castlevania Legends, for example. And it's not just the four-color palette that you can select during bootup when the Game Boy animation appears, they seem to be completely independent colors (pink, green, black and white at the same time in Adventure Island, for example).
These are Game Boy games, however, not GBC. When I try the same games in an emulator, I only get the plain old green or monochrome palette.
Are there emulators that enable those extra colors?