I'd like to nominate Mega Ampharos to
B-
+Nothing wants to switch into attacks coming off base 165 Spa, except for Chansey
+Slow Volt Switches allow for safe switches
+Mold Breaker bypasses abilities like Shell Armor, Magic Bounce, Unaware, Lightning Rod and Sturdy
+Solid 95/105/110 bulk
+Can run an Agility set to bypass speed issues, which can outspeed Greninja by 1 point if Modest 252 Spe after an Agility
-No reliable recovery - needs to run Rest or have Wish support for longevity
-45 speed leaves it weak to threats, especially bulky fairies
-Uses a Mega slot and has to deal with really tough competition for the slot
-Struggles against Rain and Sand teams
-Special movepool isn't great - has to rely on Focus Miss and Hidden Power in some cases
I find this is quite effective against Stall right now (well on paper it sounds really good) as it can deal with Unboosted Sableye, Skarmory, Heatran, Mega Altaria (if HP Ice), Clefable, Slowbro, Ferrothorn, Gliscor, Hippowdon, Amoonguss, Alomomola, Phys Def Quagsire, Defensive Landorus-T, Rotom-W and there are only a small number of threats it struggles with.
It's also quite good against Offense aswell, since barely anything can switch in
- Mega Metagross can't switch in since it's 2HKOd by Thunderbolt and cannot OHKO back
- Landorus-T doesn't want to take an HP Ice and Defensive sets can't switch in 4 Atk Landorus-T Earthquake vs. 200 HP / 0 Def Mega Ampharos: 288-338 (77.6 - 91.1%) -- guaranteed 2HKO
- Lati@s don't want to take a Dragon Pulse
- Thundurus can only 3HKO with HP Ice or Focus Blast 252 SpA Life Orb Thundurus Hidden Power Ice vs. 200 HP / 0 SpD Mega Ampharos: 153-182 (41.2 - 49%) -- guaranteed 3HKO
- AV Azumarill can be speed crept and dropping bulk increases the chance of Ampharos OHKO'ing
- Gyarados, Slowbro, Bisharp, Mega Scizor, Keldeo, Talonflame, Mega Pinsir, Gengar, Clefable and Manaphy all lose to Thunderbolt
- Excadrill, Heatran, TTar, Mega Lopunny all lose to Focus Blast
- Gliscor loses to HP Ice
- Garchomp struggles to OHKO 252 Atk Garchomp Earthquake vs. 200 HP / 0 Def Mega Ampharos: 314-372 (84.6 - 100.2%) -- 6.3% chance to OHKO
tl;dr I find Mega Ampharos is really underrated despite being pretty slow and taking up a Mega Slot and imo, it is not on the same level as any of the other C+ ranks and it deserves a raise to
B-
Also, I find that Mega Ampharos is simply better than Mega Camerupt for multiple reasons, if anything it should be on an a
higher ranking.