Since S rank mons are defined as having no opportunity cost, by definition megas and arceus are in eligible since arceus has the high opportunity cost of being unable to run another arceus form while megas have the high opportunity cost of being unable to run another mega.
Concerning Arceus, you're saying that because something is so flexible, we shouldn't make it an S-Rank since there's supposedly some opportunity cost in not being able to use a different set with the same Pokemon. I'd disagree. We might treat the sets as separate Pokemon simply because of how diverse they may be, but that doesn't mean they should be treated as separate Pokemon when considering opportunity cost.
Mewtwo on the other hand, I think should be split up just for the sake of measuring viability for team building (which seems to be the focus of this thread). I realize that as a general rule the Megas should be considered as the Pokemon themselves, but Mewtwo's two Mega Evolutions are substantially different from on another, just as the Arceus Formes are (if not more).
I'm also going to argue against using strict criteria against placing Pokemon in the upper parts, simply because taking a few that might be called S rank (such as Arceus-Normal) down to A+ would not really be appropriate given how easily they may be placed on a team, and how much of a threat they may pose to the opponent. Because, while Arceus-Normal doesn't offer much defensively, it's a massive threat that fits on most teams. At the same time, Pokemon such as Groudon offer utility, may be placed on a lot of teams and have great capabilities offensively and defensively, but lose to the majority of major and common threats. Offering Stealth Rock, Roar, Thunder Wave and more to stop physical sweepers isn't that beneficial when the majority of the top 10 is using special attacks, or kicking your ass with Sun-boosted moves.
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Anyways,
Arceus-Normal's for S. Using an Arceus isn't really an opportunity cost, as I previously explained (look at how much Extremekiller's used over the other Arceus formes as well, before you argue about "needing" another Arceus forme). In the case of Extremekiller, it has so much sweeping potential. While it's true that it may be stopped, minimal support in the form of a teammate to defeat the few defensive threats that might threaten Arceus almost always leads to a clean sweep.
I'm suggesting that we keep Xerneas in the A+ Section. While it's a massively strong threat that may be tossed on to any team, it has a major flaw in only being able to set up properly once, and the other sets it has aren't nearly as threatening or by any means flexible. At the same time though I feel conflicted just because of how strong Xerneas is, hard counters that are specific to it are in high use. In other words, it was so good that it became harder to just sweep a team out with. 4 Moves+ LO is somewhat appealing in that it doesn't just become useless if you mess up your set-up, but it still needs Aegislash and the other same counters out of the way and it's much easier to stop. I don't really think Aromatherapy's that useful in this meta either, so there's that too. Scarf's pretty cool though.
Ho-oh in A- Rank. It's insanely good, but it really relies on Defog which is not entirely reliable, and there's a large cost in the support that Ho-oh needs (being that you lose your hazards/other support too). I'm avoiding placing it into the B rank only because Ho-oh does have some features that somewhat compensate for its issues (Regenerator and Sacred Fire's Burn chance). Ho-oh can fit on a large variety of teams and currently a huge threat in the metagame, but I don't think it should really be A+ or that.
I love Arceus-Rock, but it really deserves a B+. It counters Ho-oh, but it doesn't really have anything astounding going for it outside of that. It's trounced on by Kyogre, Blaziken, Mewtwo, and others, and it isn't a handy resist to common moves in the game. As a minor plus, it has coverage over Lugia, but Arceus will usually find itself being Toxic stalled.
Groudon's a B+. Nowadays, it just can't keep up with handling the biggest threats in the metagame. Kyogre, Xerneas, Yveltal, Ho-oh, Mewtwo, and Darkrai beat it one-on-one. It's an excellent sweeper, but it requires the right kind of support to function well.
Rayquaza's not really useful as it was before. SD loses to fast Xerneas, and DD only KOs if it runs Adamant AND V-Create. Also, Rayquaza relies on Outrage to hit like a truck. Unfortunately, that becomes significantly more difficult to use when Fairies now exist. Mixquaza has lost its worth with Mega Mewtwos and Yveltal in the mix. SDQuaza is pretty much outclassed now by Extremekiller. That said, if it can set up and has a good amount of support, DD Quaza can really threaten a team. B+
Deoxys-S really shouldn't be higher than a C+ now. HO or not, Defog is common now and pretty much kills your hazards. Going down 5-6 isn't really worth it if you lose any gain you had in that one turn. At best, you could be a turn ahead to sweep with for the purposes of Defog, but without your hazards, HO tends to have a harder time fully delivering on those KOs. On HO it works, but you would have to keep up the pressure constantly.
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