If you're fine with their prevos being the ones that are good, I had a short-lived OM called Swapmons last gen that basically "inverted base" stats depending how high or low they were, using Arceus and Sunkern as the two extremes. I don't plan on resubmitting it, let alone hosting it, this gen though, so fair game if anyone wants to dig it up and try it. I just ask for credit for the original idea.I want to make a meta were Pokemon like Ledian, Sunflora, Farfetch'd, Kricketune, Wigglytuff, and Delcatty are good that is not too gimmicky.
Edit: I dug for you.