I have a suggestion for digimon like Psychemon, Black Agumon, and the other recolored digimon. You could give them shiny rates and place them in the same areas their original versions are, OR you could make the original versions have the shiny rates(since they're actual starters), and make the others common. I'd imagine either way would work, cuz if they were starters you'd want them to be hard to get, and a lot of people also want the alternate versions. This is of course if you decide to add them(Although there are already a few in). They wouldn't have to be direct shinies though(since shinies are only color replacements, you could always give them different stats and abilities/movesets too).