Found it. This is my result from doing the picker just yet:
And this was my result from the exact same picker (but with 20 instead of 12) back in 2017:
So not too different. 
Oh, and I was also able to find the results of some other similar tests, like favorite Pokémon per type:
Dream team of 6:
Dream team of 6 of a single type:
I guess the favorite of each generation that’s currently going on here is what’s missing, haha. 
Greetz,
Quuador