Quick Noms.
Pelipper/Swampert to B+/A-.
These bad boyes just won both game 5 sets of invitational, are well represented on the top S16/17 teams, and overall just have incredible raw power level, warping games completely in favor of the user if their opponents aren't prepared.
Lets start with the obvious: these are lightyears better than all the other mons in B, and I would argue are at the same level of viability as the bottom mons in A- like excadrill. Why the hell is it in a tier with A-Muk, Prim, Manetric and other forgotten relics on USUM?
Pelipper is the best weather setter in the game, in my opinion, and has the ability to either have the most longevity of any weather setter with u-turn, roost, and great bulk, or it can run a Z move/specs/scarf to catch even prepared opponents by surprise. This duality is something Char-Y cannot boast, it is excellent in both roles as a weather pivot/wallbreaker.
Its partner in crime, Swampert, outside of outspeeding the majority of the unboosted metagame under Pelipper's rain, benefits from having incredible type synergy and the ability to take down foes that wall Pelipper. Swampert under rain does an absolutely ridiculous amount of damage output, putting even resisted foes in geopardy after including waterfall flinch chance. It also has the offensive coverage to neutrally or super effectively hit just about everyone. Mons traditionally considered safe, such as Ferrothorn, crumble to focus punch, and sub helps pert completely mop up passive damage options such as toxic/leech seed. You can also forgo coverage to run rocks, to pressure traditional checks like Zard-Y and make switching in that much of a bitch to deal with.
Both of these mons, despite being labelled as one dimensional, have a lot of versatility. For their ability to cause absolute respect on team preview and having the most unpredictability of weather cores, they should both go to B+/A-.
Also: If anyone wants to do ferrothorn to A+ as well, please feel free. This thing is an absolute menace and has gotten even more unbearable now with the curse variants becoming such a bitch to deal with and also outright walling/sweeping so many varieties of teams.
I've been thinking this for a while, despite certain horrendous matchups it is clear that Mega Swampert in particular is a beast. With solid secondary cores, you can negate a lot of Rains bad matchups. I'd argue that never mind as good as Excadrill, Swampert is better though it does mandate a certain style and take up a mega slot. I did mention that Mega Swampert/Pelipper should be possibly promoted instead of Politoed being demoted a few weeks ago.