Originally Posted by Fat FaceFaceFace
...but Hydro Pump being 80% accurate is very iffy. WIthout rain, it's like a SpA Terrakion with an 80% STAB move...or Surf. With Keldeo's lackluster defenses, a miss can be very costly.
Just saying, Stone Edge is an 80% accuracy STAB move on Terrakion, so I don't see your point on the accuracy part. IMO, Keldeo is definitely A due to the prevalence of rain and the fact that rain and STAB effectively doubles Hydro Pump's 120 base power.
The main issue is that every set has its own walls and its own flaws, but that doesn't deter it from wrecking havoc. It fits the definition of A rank perfectly lol.
A Rank: Reserved for Pokemon who can sweep or wall significant portions of the metagame, but require some support or have some flaws that prevents them from doing this consistently. Supporting Pokemon in this rank may give opponents free turns or cannot create free turns easily themselves, but can still do their job most of the time.
Mamoswine should be in B because it can't sweep through teams on its own (normally) and mainly focuses on punching heavy holes in the opponent's team. It's been stated many times before that Mamoswine is an anti-metagame Pokemon as it has the ability to revenge kill many dragons + Therians. Life Orb (Or Banded) Earthquake coming off base 130 attack isn't anything to mess with either. It allows dragons and other powerhouses to set up/sweep once their 'counters' have been weakened.
After rocks, Earthquake off a Life Orb Mamoswine (Jolly) does:
166 - 191 (47.16% - 54.26%)
3 hits to KO (with Leftovers)
to 252 hp 88 Def (Relaxed) Ferrothorn.
(If Mamo was Adamant, it pretty much 2HKOs the on-site set for Ferrothorn after a layer of Spikes and SR)
This pretty much means that if Mamoswine forces the opponent to switch to their defensive mons (In this case Ferrothorn), Earthquake can severely weaken them thereby limiting their defensive capabilities.
The only defensive mons in the OU metagame that can take numerous hit are Bronzong, Skarmory, and Slowbro. Neither of these mons are that common in OU anymore.