First of all, I apologize in advance if I sound angry or upset in this post. I'm just really, really passionate about this topic of discussion.
Marshadow is almost certainly gonna be the next suspect after Deoxys-Defense. That's a given. The question for many is: Where do we go from there? What else should we test after this big issue is addressed?
Well, I think this is the ripe opportunity to finally get rid of an over-centralizing tumor. Unlike Marshadow, who has only been around for a little under a month, this guy has been a presence practically since the beginning of 1v1. It has completely shaped and rended the meta around it, even with the introduction of such incredibly powerful fairy types this generation like the Tapus and Magearna.
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I do believe that it is time to finally ban Kyurem-Black.
To truly understand why this behemoth is so broken, I feel like I should first analyze the other big S rank threat.
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Mega Gyarados is freaking strong. There is no denying that. Pre-mega, it has Intimidate to cripple physical attackers, and with Mold Breaker, it automatically invalidates Sturdy users. It has access to a very nice Dark/Water dual STAB, great bulk, and Dragon Dance, along with strong coverage options in the form of Earthquake and Outrage. It can even run Taunt to wall-break, as well as Substitute for extra set-up opportunities.
But you already know this. So why am I repeating what everyone already knows?
Well, here's what separates Gyarados from Kyurem.
There are things that can check it consistently. Tapu Koko, for example, completely wipes the floor with it. Fairy types in general can do a number on it. I've found Mega Gardevoir to be a very solid answer to it, as it can Taunt it to prevent Dragon Dance + Sub, Will-O-Wisp and burn it... Actually, it doesn't even need to do that, seeing as it just obliterates even regular Gyarados with Pixilate Hyper Beam. Bulky Grass Pokemon like Mega Venusaur can put it to sleep and slowly chip away at it's health with Leech Seed + Giga Drain while healing up themselves. There are also some other things I'm sure I forgot about. My point is that Mega Gyarados, while super powerful and definitely still a top-tier, is far from invincible. It can be checked consistently and reliably by certain Pokemon. It can even be argued that it's actually healthy for the meta, seeing as it keeps all those nasty Sturdy users in check.
And there is where the problem lies with Kyurem-Black. Kyurem has so many strong attacking options and excellent stats, as well as the ability to hold an item, unlike Megados. This means that it can run a set to circumvent each and every one of it's checks. Take Scarf, for instance. While it has risen in popularity recently over Icium Z, it's purpose remains the same: To lure and obliterate Icium Z checks. To give you an idea of how powerful and versatile it is, I'm going to go through a list of things that have been recommended to me or that I have used at some point to attempt to stop this monster.
Tapu Fini: Tapu Fini resists Kyurem's Ice STAB and is immune to Outrage, while being able to hit it back with Moonblast. Sure, Fusion Bolt is a thing, but it is possible to run EVs to survive that attack while still being able to maximize offensive potential. ...Surprise! Turns out it's actually banded! No, wait, it's Gigavolt Havoc! Welp, there goes that plan.
Arcanine: Now this seems like a solid answer to the Yin Yang Annihilator. Intimidate with Will-O-Wisp means you won't be taking anything from it's main physical assaults. In turn, you can slowly chip it down with a combination of Flare Blitz and burn damage. Haha! Nope! Just kidding! Turns out, it's a mixed/special set with Earth Power! You're still two-shotted by that attack at most, even with Special Defense investment. And if it's Specs, you will die easily. Back to the drawing board!
Mega Scizor: Ok, this HAS to be the definitive Kyurem-Black counter. It resists both of it's STABs, and it's high Defense means Fusion Bolt won't be doing much. It has Roost to heal off damage, and even with minimal investment, it's trademark Bullet Punch can still just about 2HKO. Well, guess what? HIDDEN POWER FIRE!!! While a fairly rare choice, it is possible, and it will often be enough to fell Scizor. I mean, sure, you could try to run Special Defense investment to counter-act this, but let's be real for a moment. If you have to run something as retarded as specially defensive Mega Scizor just to beat ONE Pokemon, you know we got a problem.
The only real hard-counter I can think of is Magearna. If there is ANYTHING else, please tell me so, and I will add it. But yeah. Two "counters", neither of which are used a ton, from what I've seen on the ladder.
I don't know how to end this other than by saying this: Kyurem-Black is far too good for this tier, and it's finally time we got rid of this menace once and for all.