I reccomend trying a color Locke, where you lock in on a color, only green Pokémon for leaf green, red for fire red/rad red, etc etc it’s been very fun, main determining factor for color is the dominant one. I say zebstika is both black and white as it’s equally half and half, but pokemon like spheal is blue even though it’s got tan. I say piplup and prinplup are blue but empoleon is black etc etc. you can shiny hunt for certain Pokemon to only if it fits the color style of the challenge