Zane the incineroar suddenly finds himself stuck as the second head on Sophie the rather large miltank.
***
Sophie: "Oh! You must be my new "Body-Mate"!
Zane: What the- Where am I!?
Sophie: Hiii!~ I'm Sophie! I'm a Miltank, as if you couldn't tell, haha!
Zane: Last thing I remember is I was in my cell, how'd I end up here?
*Sophie takes a bite out of an oran berry*
Sophie: Mmm... So you were already a prisoner, huh? Past couple guys that I've taken on hadn't gotten that far yet.
Zane: So you've done this before?
Sophie: Yeah! I like the company, the rest of the girls on the farm tend to keep to themselves...
*She looks around suspiciously before leaning in to whisper, as Zane leans his head further away*
Sophie (whispering): I think they find me annoying...
Zane: I can't imagine why...
***
Zane will hopefully get used to his new very talkative and cheery body-mate, if not, oh well...

So this body-mate idea, as punishment, instead of a prison sentence, criminals have their heads transferred onto the bodies of
individuals that sign up for the program. Once attached the second head has no control over the original body, but still feels everything as if the body was their own
it is seen as a way to in some ways more humanely detain criminals, still allowing them to have somewhat of a life.
as for why they're pokemon? I wanted to draw a miltank character, that's all haha.
feel free to use this idea for yourself, if you wanted to.
It's very late here, so tomorrow I might not like this idea as much and get rid of it.
anyways enjoy or don't it's your life