I am currently making shiny sprites for each Pokémon icon sprite to better match the Champions UI. If this is something that is currently being worked by anyone else then please let me know so I don't waste my time; or if anyone wants to help then please let me know. If this is something that would wanted to be implemented then let me know how the sprites need to be formatted to make the job easier if necessary. Right now I am just making a separate sprite sheet and replacing the colours with the ones from the shiny gen 5 sprites. Currently the focus is only on the mons that are (or were) present in Champions.
Normal and shiny icons for Kanto starters:
Normal and shiny icons for Kanto starters: