There is a correct answer but my last post implied that there wasn't. I literally posted and went out and a post came in while I was typing and I didn't see it. I wasn't being a cunt it was pure chance if you look at the times of the postings.
The winner is triseros - its the only season every team beginning with p were in the same division.
Technically, it isn't the only season that every team beginning with the letter p played in the same division.