One Pokemon that I highly disagree with it's placement in this thread, is Conkeldurr. Sure, we all know that Conk is one of the slowest offensive Pokemon in the game, but honestly, Conk has several things going for it that make it at least B- rank.
First off, Conk is blessed with three amazing abilities; Guts, Iron Fist, and Sheer Force. Guts has always been the most commonly used ability on Conk since it makes him a go-to status absorber, punishing anything that decides to stay in on a boosted Drain Punch, Mach Punch, Stone Edge, etc. Iron Fist boosts all of Conk's punching moves, and thankfully, Conk has a ton of punching moves to abuse the ability. ThunderPunch can be used to hurt Gyarados and Jellicent, Ice Punch can be used for Landorus-T and Gliscor, Drain Punch is given a buff to add to its healing effect, and lastly Mach Punch is boosted, giving him a more powerful priority move. Lastly, Sheer Force is an incredibly underused ability. With Sheer Force, Conk's myriad of boosted moves are boosted even more than Iron Fist. ThunderPunch, IcePunch, and Fire Punch all of similar power to Flamethrower, Ice Beam, and Thunderbolt, while Rock Slide has almost exactly the same amount of power as Stone Edge, but with much more reliable accuracy. Even better, Life Orb can now be used on Conkeldurr without having to worry about the recoil from it, making this set even more powerful then his Choice Banded set!
I feel like Conk's terrible speed is easily balanced out by his outstanding attacking power, bulk, and a semi-reliable recovery STAB move that hits a large portion of the metagame very hard. Mach Punch may be a weak priority move, but coming off of Conks massive attack, it still deals a good amount of damage to anything that needs that final bit of HP chipped away. Conk may not be the most amazing Pokemon around, but I think it at LEAST deserves B- rank. It's far more useful then half of the C-Rank Pokemon, and it definitely doesn't suck in this metagame, like most of the C-Tier Pokemon.