How would you feel if pokemon containing multiple "members" could be partially shiny? Let's take Magneton for example, one, two, or three of the magnemites could be shiny while the others remain the same color.

Maybe to make it easier for people who want the shiny, you divide the full shiny rate per "member".

Magneton = 3/4096 or a 1/1365 chance of a part of it being shiny.

Falinks 5/4096

Exeggute 7/4096.

Then for example with exeggute, who evolves, maybe have a 1/7 chance of being the full shiny if it evolves. Predetermined like Dudunsparce so you can't save scum until you get it.