None of the Pokemon you mentioned can safely switch in on Charizard Y except for the blobs and even they can get wrecked by a sun boosted flare blitz. The few things that often get in safely are often outsped and KOed. Only Lati@s can actually come in and KO in almost every situation and they are both manageable. I would say that this utility alone puts Charizard Y at the very top of the A+ ranking as a wallbreaking support threat, however, it is even more difficult and unpredictable because it could also be Charizard X.Heatran....
Also, I don't think Mega Pinsir is a A+ Pokemon, it is easily an S Tier. The reason why its checks and counters have become so popular is because you NEED them. Mega Pinsir is one of the scariest pokemon in OU without a doubt. Though I feel Mega Charizard X is overall better thanks to a immunity to burn and roost healing. Charizard doesn't have the raw power of +2 Aerilate Return. One of the most powerful moves in all of OU.
+2 252 Atk Aerilate Mega Pinsir Return vs. 252 HP / 252+ Def Rotom-W: 169-200 (55.5 - 65.7%) -- guaranteed 2HKO after Leftovers recovery
Even bulky Pokemon such as Rotom-W thats resist its STAB cannot switch into it. And with excellent coverage in Earthquake, a 78 power priority in Quick Attack. He also forms one of the deadliest offensive cores in OU alongside Talonflame or Staraptor. For these reasons, I believe Mega Pinsir is a S rank pokemon and the second best mega evolution in the tier.
Although Mega Charizard X is a S rank pokemon, there is no doubt about it. I think Charizard Y should be moved down to A+. Although Charizard Y is easily one the hardest hitters in the tier with Sun-Boosted Fire Blasts coming off 458(!) Special attack. He just is too easily revenge killed or just out right stopped by the following pokemon
-Blissey
-Chansey
-Garchomp
-Excadrill
-Terrakion
-Snorlax
-Mega Charizard X
-Talonflame
-Tyranitar
-Latias
-Latios
-Goodra
-Thundurus
-Dragonite
-Landorus-I
-Landorus-T
-Heatran
-Hippowdon
Also, the definition of a S-tier Pokemon is
S Rank: Reserved for Pokemon who can sweep or wall significant portions of the metagame with little support, and Pokemon who can support other Pokemon with very little opportunity cost ("free turns"). Also the home of Pokemon who can easily perform multiple roles effectively, increasing their versatility and unpredictability. If the Pokemon in this rank have any flaws, those flaws are thoroughly mitigated by their substantial strengths.
Unfortunately, Charizard Y cannot sweep or wall significant portions of the metagame with little support. Unless a near mandatory Pursuit trapper and Defogger is little team support. Charizard Y also cannot perform multiple roles. Its too slow to be a sweeper, so he usually only is used as a wallbreaker. An actual S rank Pokemon, such as Charizard X, doesn't need much more than a Defogger, and can be used as a Sweeper, Wallbreaker, Bulky Sweeper if one is running Bulky DD, or Tank if it is is running the tank set.
I would support Porygon Z for D rank as well. It isn't overwhelming, but adaptability boosted Tri-attack is absurdly powerful coming off a base 135 attack. Porygon Z's problems often come in the form of weak coverage moves in comparison and the lack of switch in opportunities due to its mediocre bulk and its slightly disappointing speed tier. It can certainly be devastating on the right teams though. Just as an example.One underrated mon that you should at least consider for D/C- rank is Porygon2's oft forgotten brother, PorygonZ. While there isn't as much of a shortage this gen when it comes to good non-Uber Nasty Plot users, PorygonZ's access to Adaptability, absurd base SpA (the only other Plot/Glow abusers with that kind of power being Manaphy counting the free +1 from Tail Glow and Thundy-T) as well as nice coverage overall with Tri Attack/Dark Pulse/HPFighting give him a solid niche. His retarded amount of power even before a boost means that he forces quite a few switches with which he can boost up. He can also run Specs, Scarf, Agility, or even Double Dance if you're feeling ballsy, all rather smoothly but they don't seem to work quite as well in OU from my experience. He's definitely not amazing, but with the right team behind him he can deadly. Granted, my main account is still in the 1500s, so maybe I've just been fighting scrubs who can't stop a booster.
252 SpA Choice Specs Adaptability Porygon-Z Tri Attack vs. 252 HP / 4 SpD Blissey: 208-246 (29.1 - 34.4%) -- 99.8% chance to 4HKO after Leftovers recovery
252 SpA Pixilate Mega Gardevoir Hyper Voice vs. 252 HP / 4 SpD Blissey: 177-208 (24.7 - 29.1%) -- possible 5HKO after Leftovers recovery
It is more powerful than Mega Gardevoir's Hyper Voice. That's pretty impressive. Unfortunately normal type attacks aren't too difficult to work around and like I said earlier, it's coverage moves are not nearly as impressive. So Porygon Z for D.
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