thats not a glitch. That is part of the gameboy color hardware. you are just swapping color palletes.
read more about it here Game Boy Color Modes – GB Studio Central
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Oh so this can be done on other games too? I literally only played Pokemon on mine so wouldn’t have known otherwise.
You learn something new everyday! Thanks!
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np, its one of those wacky things you just don’t know unless someone has done exactly what you did! So honestly bravo for being one of the few to figure it out. As the article says, the gameboy color itself has special color palletes hard coded into it for a select handful of games. I think the most notable ones are probably nintendo games. So try all the color combos, see what you like.