Chaos Wolf
The classic
Ok, this just is a little theory that I had but perhaps the shiny nido- family are rare due to the fact they are not considered true mates to the their species.
For example, Give that nidorans detect potential mates solely off of their color and scent. A shiny nidoran male would give off the scent of a male, attracting the female. However the female would not see the male as a mate because it is the color that the nidoran female line normally is. All the female would believe it to be is an oddly shaped nidoran female with a male in the vicinity. the shiny nidoran male would never be given the chance to pass on it's genes and thus the shiny male would only occur as a genetic oddity. the same thought could apply to a shiny nidoran female.
If the given is only half true, meaning it is solely on color rather than smell. the chances of the given male mating with a female are even lower.
If the given is merely smell, the theory then does not work.
For example, Give that nidorans detect potential mates solely off of their color and scent. A shiny nidoran male would give off the scent of a male, attracting the female. However the female would not see the male as a mate because it is the color that the nidoran female line normally is. All the female would believe it to be is an oddly shaped nidoran female with a male in the vicinity. the shiny nidoran male would never be given the chance to pass on it's genes and thus the shiny male would only occur as a genetic oddity. the same thought could apply to a shiny nidoran female.
If the given is only half true, meaning it is solely on color rather than smell. the chances of the given male mating with a female are even lower.
If the given is merely smell, the theory then does not work.