There are plenty of Pokemon mods for other games on Nexus, as well as other mods that incorporate copywritten content.
I’m guessing they just got scared off after that guy got a dmca for making a Pokemon mod, even tho part of why they did was because they were paywalling it.
Game kinda already has that implied. One pal's description says that pal is looking for a night of love and at first it was only going after other pals, but eventually started chasing humans too. I'm not kidding.
Even real Pokémon has things like humans marrying Pokémon in its lore. Not at all a surprise that the "Edgy Pokémon" would push the boundary a little further.