There's a few non-Nintendo pokemon mmo's that are pretty close to that, without the old regions.
Mini Mii Wii
I wish they sold this 6 years ago
Shuckpluff is your new god. Obey or be Leech Seeded.
Then you will learn the error of your ways, fool! How dare you insult the mighty Shuckpluff, who has higher stats then Arceus?