You know…a while back in my younger days I went through my Pokemon phase (mainly with Gold/Silver on GBC), and being the super rare find addict that I am I practically drooled over grand aspirations of finding a ‘shiny’ version of each monster (it never happened of course lol - I think I found 5 tops…).

Why not incorporate that with S2’s breeding?
Could create a basic pallet swap or some sort of black/white ‘shadow’ version of every creature in the game and then go with a 1% chance that that shiny would hatch in an egg.

That would give the 100% completionists something to weep over lol.