>>33658039There are three reasons for this
1. Pee fetishes for one reason or another are becoming more mainstream. Dunno why, not complaining though
2. XY, SM, and Go have put Pokemon as a series back in the collective conscious of the people, so more artists are drawing Pokemon characters again, and so there'd naturally be more artists drawing Pokemon that also happen to have this specific fetish
3. Lillie happens to sorta be the most popular character from SM, so of course, artists would gravitate towards her, particularly if they don't actively follow the series still, to put out art of a character people are currently all talking about
There's also a lot of Lana pee pics out there, for the same reason as the first two points, and she's also a pretty popular character, but in her case it's specifically because of the swimsuit