-Like Icy, While I didn't make the requirements [Blame being busy with getting prepped for Uni], there is nothing in the OP that says that only people with requirements can nominate, and, indeed, usually, it states that anyone can nominate.
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Pokemon to Ban:
Excadrill:
It's been said over and over and over again. But I'm gonna say it one more time. Excadrill is too much for the metagame. Remember how the Metagame was when Salamence was still in the Platinum Metagame? Well, imagine that, but worse. That's what Excadrill effectivly is.
Excadrill, with absolute minimal support [Switch in Tyranitar or Hippowdon at some point in the game] renders entire playstyles unviable. No single pokemon within OU should have that power.
For that reason alone, Excadrill should be booted out, but there's more:
Excadrill lacks counters. There is only one, hard Excadrill counter, which is Gliscor, and even then, he's somewhat gimping himself, as to reliably beat Excadrill, he has to run Poision Heal, which sacrifices the option to run things such as Acrobatics and Roost.
Skarmory can come in and delay Excadrill, but what can it do back? Whirlwind. OK, you brought in something you have to switch out of, so you get no time to Roost. Excadrill comes back in. Skarmory can't WW a 2nd time.
Brongzong is a joke in this metagame.
Everything else is either a shaky check or a revenge killer.
Politoad:
I'm not for banning abilities except when it would avoid a mass banning, such as the Moody Case. However, the sole reason why I am nominateing Politoad is Drizzle.
As the sole user of Drizzle, Drizzle is part of Politoad, and thus, Politoad should be removed from the metagame in my opinion.
Why should Drizzle be removed from the metagame? Just take a look at the shifts in the metagame, and the past suspect tests. It dosen't take five seconds to notice that the top 10 are mostly Rain checks, such as Tyranitar and Ferrothorn, or Rain abusers, such as Rotom-W.
Then, there's the massive spike in use of Celebi, which at least can be argued as being useful outside of rain, and the gargantuan leap Gastrodon of all things did. A pokemon that is a dead teamslot against anything but Rain, that has leapt from RU/NU useage to OU. That, my fellow forumers, is a flashing red light.
But it dosen't stop there! The recent useages showed that Tyranitar is being used more than before, but Excadrill is being used less. Now, how many Sand-abuseing teams do you see without Excadrill? Not many.
So what could explain this? People getting so desperate to defend against Drizzle with teams that do not revolve around weather, that they resort to what is effectivly the closest to neutral weather you will see in this current metagame.
The final reason is one I've already touched on, the past suspect tests. Drizzle has gotten a significant [Although not large enough] vote each test. In addittion, two bans have already been made to save Drizzle. Manaphy and Swift Swim + Drizzle, a combination ban that has opened the floodgates, and was origionally, as far as I am aware, intended to be a tempoary solution to give Drizzle a fair test without Swift Swim.
The fact that it's still centralising the metagame to the degree Gastrodon makes OU, and is still a massively powerful playstyle means, in my opinion, it's time to end besting around the bush, and put the toad away for good.
However, if my reasoning behind why we should ban Politoad instead of Drizzle is not adequate, please count this nomination as one for Drizzle instead.
Espeon:
The way I see it, Baton Pass in only an issue because of Espeon right now. Without it, you can Taunt, you can Haze, you can Phaze. Espeon means Baton Pass teams are many times more flexiable, and can afford to run things like Mew over SoundProof Mr.Mime. I think removing Espeon is what should be the first step, before outright banning an entire playstyle.
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Abilties to Ban:
Drizzle:
See Politoad Paragraph
[Honorable Mention to Drought, but I feel that it should get a fair shot without Drizzle and Excadrill first. Sand is not listed because Excadrill is the only real issue, other than Garchomp]
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Pokemon to Unban:
Deoxys-N
Never got a fair test. It was banned, while it was outclassed by Deo-A completely. Bring it down, give it a fair shot. Then, if need be, kick it back upstairs.
Manaphy [If Drizzle/Politoad is Banned]
This goes without saying, I doubt Manaphy would be broken if he can't run Hydra-CM Rest under infinite Rain.
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Bigger Picture:
With Excadrill banned, Sand would have lost both its broken powerhouses. The Ground-Genie is good, and Terrakion is passable, and Sand-based stall still exists, as well as Sand as a damage supplement. None of these are broken.
In addittion, with Sand still existing, Drought may not dominate the metagame comletely, especially with the flaws that Fire and Grass types have, as well as Drought itself [Double Speed OR Double STAB, as well as Grass getting their weakness amplifyed]. It should get a fair test. It could be that Volcarona is the only real issue with Sun for all we know.
Alongside banning Baton Pass, the metagame would initially be unstable, but, hopefully, would settle into a state where most playstyles can be used. Without Rain and Excadrill in particular, HO could be used again, as well as Scarfed pokemon.
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EDIT:
Also, because of a sudden wave of support... I'm going to nominate something to REMAIN Uber:
Blaziken:
Blaziken has it all, excellent STABS, enough bulk to take attacks from a wall, and enough speed to outspeed them, He has massivly powerful STAB attacks in Hi Jump Kick and Flare Blitz, as well as coverage moves such as Shadow Claw and Stone Edge, which mean there is NOTHING that is a counter to Blaziken, because everything can be hit hard. His Base 120 Attack means he dosen't even need to Swords Dance, and Base 110 Sp.Atk means going mixed is more than viable.
Blaziken can also make excellent use of both Work Up and Swords Dance. In addittion, under the Sun, very little can take Blaziken's Fire attacks, and the water types that check it, such as Slowbro, have a much tougher time. Azumarill's Aqua Jet no longer OHKO's for example.
All Blaziken needs to do is switch in one something like Ferrothorn, and it gets a free set-up move, and a +1 to speed, allowing to it outspeed most of the metagame.
Anything that does beat Blaziken is absolutely crippled first, and usually requires a sacrifice to get in safe. In addittion, none of them can really punish Blaziken for switching out, by laying hazards or the like, meaning Blaziken can just come back in later, and do it all over again.
For this reason, Im nominateing Blaziken to stay Uber, despite numerous calls for a re-test.