I listened to Game Theory and it just said that Nurse Joy is actually a Chansey is disguise. But the main theory is: I've been looking for the answer this whole time, Nurse Joy is an ACTUAL FULLY CATCHABLE POKEMON! I've seen it all... There are serious variants of Nurse Joys in the Pokémon Franchise. I've looked it all up that she had a lot of stuff inside all of the Poke Centers.
How can she be actually none other than Chansey for all of a sudden?
We've never seen this before in my life.
This franchise creeps me the heck out for all of a sudden that no one seen before?