>>53384552>how common would pokefucking be in the pokemon universe?Already canonically a thing. We have several characters who outright state that they're in relationships with their Pokemon over several games, as well as the notorious 'Machamp Cafe' comic. Interestingly, it's always female humans who seem to be the ones flaunting their relationships...
We also have the (canonical) depictions of Ditto assuming human form and interacting with humans (including one ditto in USUM who assumes the form of a masseuse and is implied to be giving clients a 'happy ending')
>would it be looked down upon/get you sent to jail?Doesn't seem to be - all of the people who mention it seem to flaunt their relationships pretty openly.
>would it vary by region?Also does not seem to be the case.
>which region would legalize marriage between a man and his pokemon?Probably Sinnoh, given that it was already canonically a thing in their past. That being said, you don't have to marry your pokemon to be in a stable, permanent relationship with them.