I believe Empoleon should get C+ or B- due to being one of the best Defoggers in the game with a plethora of resistances, including a resistance to SR and an immunity to spikes coupled with the fact that it can clear and set up hazards in the same set. While not many people have used it it has this small niche, and a very good one at that.
Porygon2 should be nominated somewhere along C+, B-, or B as Fairy's have made Fighting types drop in usage, special moves have been nerfed so it takes special hits even better, weather has been nerfed so boosted hits won't be hitting it very often and it is a great check to many pokemon with it's amazing bulk and solid support options.
Crawdaunt deserves C or C+ because of the raw power it has and it's amazing niche at crippling just about everything that doesn't have Mega in it's name with Adaptability-boosted Knock Offs and it's newfound toy, Aqua Jet, which lets it hit harder than Azumarill's Aqua Jet. Dark's buff was very kind to it as well and although it can't switch into much, nothing can switch into it either.
Entei gets a special mention as a C+ at worst due to it's new toy in Sacred Fire, which, coupled with Assault Vest, makes the fire dog impressively tanky, and nothing really wants to switch into a 100 BP STAB Sacred Fire, either due to it's power or just that 50% burn chance. It also serves as a phenomenal check to Aegislash as it can 2HKO most variants and Sacred Fire is a non-contact move! It can also run a Choice Band and spam Sacred Fire, because no one in their right mind want to switch something into THAT.
Finally, Togekiss deserves B+ because it's new Fairy typing was a godsend, changing it's nuetrality to the powerful Fighting type into a 4x resistance, also giving it a 4x resist to Bug, an immunity to Dragon and Ground, all common attacking types in this meta, making it an amazing counter to a plethora of pokemon, most notably Dragons (as a lot of dragons have Dragon+Ground combos) and just shuts Chomp down. Did I mention it's bulky as hell, can Defog, has reliable recovery and can still paraflinch like there's no tomorrow? Yeah.