Based Spain, China (See Below), Madagascar and Belgium
(Thanks to @Sea_Gull for bringing this map to my attention!)
Edit: Since this used Google data, China is notably missing here, but if a commenter on a random Nintendo fan site covering this is to be believed:
"I'm currently living in China and I can say first hand people LOVE psyduck and slowpoke. they're in memes and KFC toys and everything"
China stay winning.
They purposely excluded the other generations, so the data is just most popular gen 1 pokémon.