Sintax Error did say it'd end up evolving into a more humanoid look when I mentioned Asha x Pupjaw scenes wouldn't be a sight most would want to see since. Though IIRC professor Wormwood did say something along the lines that the 2 Pokemon they made for human-Pokemon breeding were on the "opposing sites of the spectrum". This was also after he said they found out only "human-like egg group" Pokemon could breed with humans.
So whether the "opposing sites of the spectrum" literally just means a male and female approach in breeding with humans, like if the Pokemon can actually breed then Adalass would be the only source of Pokemon/Human hybrids till it's children can breed with others whereas Pupjaw could just seed multiple human women at once and impregnate/ensure dozens of offspring a day. Or if the "opposing sites of the spectrum" mean that they tried to make Pupjaw the bare minimum of being in the "human-like egg group" to breed with humans, like
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and
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are the least "human-like" in that egg group but they're still in it, while they made Adalass as human-like as possible.
I think Pupjaw looks good as a fakemon but in the context of it being a Pokemon made for a hentai game with cross-breeding it's hard not to imagine it being involved in plots like those bestiality/monster doujins where the monster traps multiple women and rapes them into being seed-beds/breeding slaves. I hope that isn't what's planned but that's honestly what it looks like to me.