When i think about it...
Why there's no pool for pictures about Pokemon20? It's much more popular series than Touhou, which got its own pool for posts like that.

Because no one here thought about it.
You can do it yourself, if you want.

That could be right between the Japanese and gaijin over 30. But just look at the tag count.

Pokemon 31k
Touhou 492k

Now pixiv:

ポケモン 514,057
東方 1,897,152