Ait, I've done some laddering (not a whole lot, I'm a fucking lazy bastard) and made myself an opinion on the current suspects. I guess I'll start off with my initial thoughts though, to give you all an idea on the way I persuaded myself in one way or another.
My initial thoughts regarding first Dragalge was that it was by far ban-worthy. It's massive power, great STABs and good coverage destroyed any kind of switch-in quickly. If you didn't run Bronzong or Registeel, then you'd always lose a mon to it's draco. It's speed, while crippling, was of little issue in the long run as the great typing and above average bulk it has allows it to switch in on a selected few threats and force them out. Considering how useful Toxic Spikes are in any kind of meta that isn't Steel/flying types only, the access to such a move allowed Dragalge to perform beyond the standard Specs Nuke set, and there's also the Haze set that bullies Slurpuff mainly. So yeah, I have only held this thing in some dislike and inclined to ban it.
But I probably wouldn't start off like this unless my thoughts on the subject changed. Granted, it can nuke pretty much everything, but the same can Exploud, Clawitzer, Specs Melo... It's their job. While it forces some teams to run things like Bronzong (It really only does if your offense team can't break Dragalge in the first place...), it in turn can't do anything to Zong as it is aside from hoping for like Double Crit Focus Blast. And it's not like this is a sign of overcentralization; Bronzong is already really good as it takes on all suspects, and more highly rated mons. The bulk allows it to dodge many OHKOs, but it's still 2HKOd by most neutral hits that isn't from defensive mons. It really only is a big issue when it gets a free switch. It hates switching in on Scalds, as burns really hampers it, and hazard damage cuts into it's great bulk. And as such, while it is a really good mon... that's only all it is. Calling it broken would be, in my honest opinion, wrong a this point. NO BAN
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Next is Pidgeot. My initial thoughts where that Pidgeot was a mon that could harass anything offense. I did not know much of the Work Up+Refresh set at the beginning, but when I discovered it I kinda threw it aside and dubbed it a "Tournament only set"... because honestly, it seems like one of those strange sets that destroys that scene. Anyways, the all-out offense set had several things that held it back... and one of them is the fact that it has a small case of 4MSS... despite it's weak movepool. Hurricane and Heat Wave are musts, but the remaining moves are usually something between HP Grass, Roost, U-turn, other support moves like Toxic. You might call this "you can tailor it to beat what you want", but that argument really makes no sense. If it has the tools to beat everything, maybe it wouldn't need to tailor itself to things. Anyways, Pidgeot has a good amount of checks, such as Rhyperior, Bronzong, Registeel, SpD Golbat, Regirock, Jolteon and the likes. And to be honest, it's best way around them all is praying for Confuse hax. So, I didn't really find it broken and would say no ban.
Honestly, my opinion really didn't change a whole lot. It's really good at what it does, making Offense struggle somewhat, but it's 135 SpA is good, but not amazing. I often find myself doing just not enough damage to kill things, and I stand by my old opinion of it: It's a "jack of all Moltres, master of none". I stand by my NO BAN
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Finally Serperior. I found this thing to be an absolute monster, setting up using it's strongest STAB alone is absolutely crazy, and the way it fucks around with Stall (which is my playstyle of choice really) was too bad for me to handle. It's got excellent speed, good bulk and defensive typing(sorta), many sets that differeniates itself from the others, and Life Orb Leaf Storm makes up for it's weak SpA stat. This mon can set up while revenge-killing things, something that really hasn't been the case ever before.. in RU atleast. In many ways I found it comparable to Mega Kang from the get-go, in that it can use it's bulk to take on things while setting up in a highly offensive method. but I did acknowledge it's poor STAB typing and it's coverage moves (which isn't the case of Mega Kang, obviously), and that's why I thought "Oh well, it's too good for RU, but alright in UU or something". So, a combination of excellent speed, alright power on the setup move, and good bulk made me find this thing broken and bad for the meta.
And God was I wrong. I admit it, I overrated it tremendously. This thing is without doubt a really good mon, being a revenge-killing setup sweeper, but one thing I found myself whilst using it is that whenever Golbat or Amoonguss was on the opponent's team, I did literally nothing with Serp. I couldn't waste Leaf Storm PP, unboosted HP Fire/Dragon Pulse does literally nothing at all, and while I did run Knock Off... well, even without the eviolite, Golbat just stood there as a complete stop to it. Even with rocks up, it really couldn't break an Evioliteless Golbat. I found it the weak link of my Serperior team... and ended up removing it completely from it. Then I made a new one with Screens Serp, which worked alright... but mainly because it forced the opponent to make switches in an attempt to counter the regular Life Orb set. It could still snowball end game if it's still alive, but that's really it. Serperior is a pokemon that can snowball sweep, but it rarely happens is my final experience with using it and playing against it. And I ended up not even finding it an S-rank mon, more A really. Banning this is honestly stupid
Just to prove Golbat > Serp
252 SpA Life Orb Serperior Leaf Storm vs. 184 HP / 236+ SpD Golbat: 42-49 (12.4 - 14.5%) -- possible 6HKO after Stealth Rock
+2 252 SpA Life Orb Serperior Dragon Pulse vs. 248 HP / 172+ SpD Golbat: 157-186 (44.4 - 52.6%) -- 21.5% chance to 2HKO
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Finally, I do not imply any of these mons are bad. They are just not broken, and that's my opinion of it.