>>45505062Stadium's are likely because they use a similar hue shift like in GSC, barring some differences due to the color pallets in the 64 game. That's how Stadium 1 also allowed for changes to the Pokémon's color via their nickname.
Colosseum and Gale of Darkness likely used a similar method for their shinies, since very few of them seem to have the colors 100% correct in the way you'd expect them to be.
