Not gonna lie, I've seen way too much "Do not ban PDon" in the BH suspect, but I've observed this trend:
Pro-Ban: Primal Groudon has Fire and Ground typing, and along with Thousand Arrows, it can hit the entirety of the metagame neutrally, and from this fact, one must have a naturally defensive Pokemon in order to make a defensive counterplay. But if you take a closer look this monster has 180 Attack and 150 Special Attack, meaning it is entirely capable of making lure sets to take down its usual checks. It outshines every single Ground and Fire-types offensively. It is dominant in usage, being used more often than that of the mighty Imposter Chansey, and no one in Generation 7 used alternative wallbreakers like Mega Garchomp, Mega Blaziken or others because they are inferior to Primal Groudon in terms of both typing and raw power. Excluding some exceptions like Zygarde-C, Primal Groudon is also a defensively viable Pokemon that can opt to run defensive Desolate Land to completely shut down standard Kyogre, Regenvest that walls Diancie to no end, or even Fur Coat which is incredibly difficult to deal with for unprepared teams due to its offensive presence. Because of this sheer versatility and unpredictability, Primal Groudon should be considered as a culprit that lessened the diversity of teambuilding and turned the metagame into a matter of "Which player abuses Primal Groudon and who gets to set up faster using such Pokemon?" It is one of the few Fire-types that are resilient to Stealth Rock, unlike Ho-oh which is excellent as a check to Pixilate Diancie on paper but has its viability plagued due to Stealth Rock weakness. It is also incredibly hard to wear down over the match due to the typing that provides immunity to Volt Switch and along with 160 Defense, it doesn't give a jack to U-turn from the likes of Audino and Giratina.
This is the full post at the top
I am in favor of the ban because the only good arguments are coming from the ban side.