>>47993423The only Monster Girl in the franchise's canon is Mother Beast Lusamine
>>47993528; which was portrayed in the games as a shrieking lunatic that only communicated after that point by screaming in pain and tried to murder two children in a fit of rage and in the anime was insane and delusional and had no control over her body (because the Nihilego was puppeteering her and forcibly kept her from leaving it willingly even after Lillie got through to her). It's pretty clear that it's not a good thing for anybody, and the strain of the fusion almost kills her, even disregarding the damage it did to her mind.
I love me some MG content but this is not the franchise for it; if I want to play a game with monster girls I'm just gonna play MGQ: Paradox. There are no MG Pokemon, and there never should be.