A semi serious line of questions for you all to ponder.
What do you think it would take for humans and Pokemon to be able to breed together?
Would it be more than just Ditto?
Would they breed true like Pokemon do already or some sort of hybrid?
What would it take for you to be convinced it'd be possible outside of evidence of it happening if you don't already believe so?
Personally, I believe Ditto breeding with humans is completely possible since we've seen them copy humans in game. Logic dictates that since Humans aren't like legendary Pokemon and that Ditto can breed with even seemingly sexless Pokemon that it's possible.
I'd also think they'd breed true with the "Mother" determining the species.
I just don't believe, outside of forces like Arceus or outside of a lab with gene modification, that there simply wouldn't be any hybridization.