BigBlueNYG
Banned
I believe in the Audino/Blissey theory.
Your trainer gets dragged down too, but is saved by his/her guardian angel, that carries them to a Pokemon Center, into safety
I like to think that random Chandelures come to steal the Pokémon's spirits, and Drifloons carry the bodies away. Going through some of the many disturbing Pokédex entries can answer a lot of questions.
We know that Audino knows Heal Pulse. Maybe Audino are rare because they are busy healing fallen pokemon.
This totally makes sense now.
They black out and return to a pokemon center... oh wait, never mind.
Maybe the reason you can't find them everywhere is because they are busy? I haven't given Chansey much thought either, but there have to be some Pokemon that you can't catch. Maybe some Pokemon Rangers catch Audinos and use Heal Pulse after a Pokemon faints.I never gave it much thought till now, but none of the other regions have a spreadout pokemon like Audino. There is Chansey but you can't find it everywhere.
I think the more important question is:
What if you catch too many of the same species? You would think it would eventually become endangered; I guess therefore they would become legendary...
Man, that's something to think about.