I’ve done it! I went though every Pokemon and created 7 charts.
I have lot of people bring up this topic, but they don’t really go that deep into why that’s the best/worst.
*What are ‘kind of’ designs? These are debatable Pokemon (they are not bad, but there not good).*
From this chart we can see that the fall in design quality actually started in started in Sinnoh.
My final findings were:
Unova, Kalos, Alola: They didn’t fail because they were bad, they failed because they played it too safe.
Johto surprising almost fell into this category; if it wasn’t for the table scraps of Kanto this entire region could of been a disaster.