>>54508078XY got a lot of art in the mega department, hoenn got a lot of love too, all characters are still loved to this day in all forms of art to this day, especially May and the occasional Mega
Alola seems to be the peak, those Lana mom and Mallow focused doujins make other properties blush, and on non ero stuff they got a lot of cute and silly art with the dex
Galar was Fujo/mind control and giant porn central, there was a huge decrease on no ero art, also apparently Japanese artists got tired of gaijins screaming at them for not drawing Bea and Nessa correctly
The DLC gave a lot of love to a certain toxic trainer but I can't find much on the rest of the cast or Pokemon,people seemed done with that gen by the time it dropped
PLA got a lot of silly art, it kinda deserves a small mention since artists had some fun here
I think it is too early to judge this gen, I can't give two craps about the porn and outside of Rikka and Larry nothing seems to have exploded art wise, maybe a bit of Brassius, Nemona and Iono here and there
Then the DLC comes and artists seem motivated, bonus points for the Miku Collab here, it's a highlight of my weekdays as of now
I can't tell probably artist have gotten cynical post alola, it's either porn or nothing most of the time with very few cute and silly artists popping in, as a matter of fact some sfw artists I follow moved on to gachas over Pokemon these days and I hope they return with the DLC