>each Pokemon has multiple shiny palettes with different roll chances
>4 "common" ones, chances are like 1/252, simple 100% palette color swaps, like moving the Hue slider in Photoshop
>2 "rare" ones, chances are like 1/1008, more well thought out colors, involving multiple sections having different colors instead of the whole palette being swapped at once
>1 "ultra rare" one, chance is 1/4032, hand picked colors and cleverly themed, maybe featuring small visual changes beyond the color to match the theme slightly
Imagine the shiny hunting autism.
