There is also:
4) Are the offensive Pokemon simply too good in the situations where Spikes are present?
I've now played quite a number of games of UU so I'm going to know what I'm talking about now. Quite frankly, I don't know why we're so hang up on Spikes when Rain Dance has been ridiculously easy to set up and abuse at the moment, but whatever. I've seen more Rain Dance than Spikestacking, but that's probably just me. Flare, I would like to see a list of Pokemon that you propose that Spikes break. Which Pokemon "sweep too easily" with say a layer of SR and Spikes down. Don't say three, because I have still yet to see a game where any more than 2 layers get laid. If the list isn't that long, it would probably better if we just banned those sweepers instead. If too many Pokemon are broken under Spikes, I'd much rather see we ban the top Spikers rather than Spikes itself. We banned Deoxys-S in OU, not Spikes.
I will give you a list of some Pokemon I have used with spikes support who have been highly successful. I will say straight up that I have not done calculations for some of these, but I will also say that calculations don't really tell the whole story. There have been plenty of people who watch me play, plenty of people who have played against me, and plenty of people who have used my team. I'm sure they will offer their support for my argument, whether here or on IRC, if you ask.
Anyway, here is a non-comprehensive list. This is all with two layers and SR, as requested.
-Kingdra. Special set 2hkos all bulky waters with spikes support with the exception of Empoleon, also 2hkos snorlax, registeel, and umbreon, which should all be solid checks and counters. LO Outrage 2hkos every single bulky water without even setting up except for Empoleon (who still faces a small chance of a 2hko).
-Raikou. 2hkos snorlax with spikes support using +1 tbolt while avoiding a KO from anything. Snorlax normally gets 3hko'd and can 2hko raikou, moving this from a decent counter to an easily beaten check. 2hkos specially defensive registeel with thunderbolt now, meaning it doesn't have to outplay the registeel user nearly as badly in order to avoid status.
-Darmantian. LO set runs past Milotic and Blastoise with just Flare Blitz (which is nearly as strong as Superpower even resisted) when spikes are on the field - both avoid a 2hko with just SR. Scarf set 2hkos offensive Intimidate Arcanine with Flare Blitz with SR + 1 spike layers.
(I don't feel like doing calcs anymore so I will just put notes next to each one)
-Chandelure (choice sets no longer need to predict, as fire blast and shadow ball both ignore resists with spikes afield)
-NP / SD Mew (absurdly dangerous, because the only thing keeping mew in check is that fact that it's a little weak, you can't even easily revenge these sets because they're so damn bulky)
-CB Aerodactyl (don't laugh, this thing is dangerous, CB stone edge 2hko'd suicune with two layers and sr)
-Subseed Shaymin (subseed forces switches that are already harmful when used with spikes, but what makes this truly dangerous is its ability to 2hkos rosie with when two layers are afield)
-Krookodile (between moxie and fantastic STABs, the only thing holding it back is the fact that it's not really that strong without boosts. spikes is infamous for helping krookodile secure quick sweeps.)
Excadrill says hi. Blaziken says hi. Garchomp says hi. The number of Pokemon the supporting condition affects is also important.
Well, say hi back.
The specific question posed to me was Roserade v. Darmantian, so I answered it. Obviously if we determined that only one sweeper was broken with spikes support from multiple pokemon, we would ban the one sweeper.
But that's not the case.
And in your example, blaziken and garchomp were broken with or without support...
At that time in UU it was "use Froslass or basically lose." This isn't "use Roserade or lose," rather it's "use one of our many spikers or lose," which is a completely different situation.
What? It's not different at all. Are you seriously arguing that three broken spikes are actually better than one broken spiker just because you can pick which broken spiker to use?
The issue here is not "we should ban [pokemon] because it's a better spiker than other pokemon", the issue is "we should ban [pokemon] because it gets spikes too easily". That's why froslass was banned, and that's why if roserade had stuck around for a while longer, it too would have been banned. Note that when we banned Froslass, Roserade actually got more usage anyway....
Also why does the support pokemon get banned? Just because? I mean I probably would say the same thing if the offensive pokemon was always banned, but why was the precedent set there in the first place?
If we were just going to ban offensive pokemon every time, we wouldn't need to have had a support clause.
Generally speaking, it is preferred that supporting pokemon are banned because they generally support many, many pokemon. There are situations where this is not the case, and in those situations, the offensive pokemon will be banned.
How does Darm 1-2HKOing pokemon make it broken? I'm pretty sure there are tons of pokemon which can 1-2HKO a lot of pokemon with little to no support (nidoking). What is a broken offensive pokemon?
Nidoking? Seriously? Nidoking is never getting past Snorlax, Umbreon, and can't even 2hko bulky offensive pokemon like Porygon2. It can't even beat offensive pokemon even when it predicts correctly - Shaymin, for example, easily survives Ice Beam and outspeeds / ohkos back with LO Seed Flare.
A better example would be CB Rhyperior or Staraptor - but such a pokemon either has strong disadvantages (speed, 4x weak to common stabs) or is banned (staraptor). If you want to know what a broken offensive pokemon is, just look at staraptor. My contention is that spikes support makes far too many pokemon like staraptor.
I think it is safe for the return of competent auto weather. Hippowdon can't do anything to Bronzong, unless he runs Fire Fang, in which case he still can't do anything.
No.
Stealth Rock.
Just a question - all the Spikes KO discussion is taking into account both Rocks and Spikes; why is it Spikes that is considered broken where Rocks are not? (And there have been countless threads discussing pointlessly and circularly whether Rocks are broken, and they're still there).
I was expecting this argument. SJcrew already somewhat addressed it a while back, but I will try to do so again.
There are a large number of differences between stealth rock and spikes. For one, stealth rock has such a wide distribution and so many effective users that if a pokemon can abuse the field effect, it is probably more efficient to ban the pokemon than ban the move. This is definitely not the case with spikes, which has very few effective users and a proportionally larger number of pokemon who can take advantage of the stacking effect. Which brings me to my next point - spikes stack, with itself and stealth rock. As passive damage starts mounting, more and more sweepers because prohibitively difficult to wall. Stealth rock by itself will only do a set, predictable amount of damage to each pokemon. You never know how many layers of spikes are going to be on the field, so something you put on your team to counter a certain pokemon could end up being beaten by it, opening up your entire team to a sweep. And finally, while stealth rock is far, far more centralizing, I never claimed centralization as an argument for wanting spikes gone (in fact, I specifically stated it wasn't).
tldr: The biggest reason to focus on spikes over stealth rock is the marginal benefit of spikes over stealth rock. (Marginal in the economics sense, not in the sense of "trivial").