Oh wait I forgot about that one. IIRC, however, this was a ROM hack of the game that was modified to work in GBC mode, allowing more colors at once. Or maybe Nintendo planned a re-release that was ultimately cancelled? IIRC the Super Game Boy color palettes were presets, though. You couldn't actually choose your own colors individually.

It's possible that it was photoshopped to draw more sales. And yeah after investigating, the color ROM hack is actually an unfinished patch that adds the colors.