From what Sweep said, he will be making a post later about Genesect taking a dive in ranking. If theres a huge power difference between the rankings due to the S- removal and A+/A moving down, then we can move A-/B+ and lower mons down to eventually balance them out. The question is, what ones should drop? Im currently thinking Ray/Tyranitar/Darkceus/Yveltal/Dialga/Deo-S (and maybe Gira-O) from A- to B+ while moving Fairyceus, Genesect, Groudon and Forretress from B+ to B. I'll update early next week with the agreed changes once we figure them out.
Supporting a drop for Darkceus / Yveltal / Tyranitar, and can be talked into dropping Rayquaza. I'd like to see Dialga stay A-, though; Shuca checks Kyogre and Mega Salamence very well, in addition to certain CM Arceus formes. It also has a good matchup vs. both Magic Bounce users, and so long it carries a status move it can beat Defog users barring the mediocre support Groundceus as well. I'd also like to see Deoxys-S stay in A-, both the Spikes and Screens sets work nicely and the Deo-S HO archetype is incredibly dangerous. It's only good as a lead, sure, but it's more versatile than people give it credit for because it can utilize Knock Off / Skill Swap / Dual Screens / Magic Coat (lel) depending on the set. I'm fine with Fairy Arceus, Forry, and regular Groudon dropping to B. However, I'd like Genesect to drop lower than that.
It's a terrible Pokemon in the metagame. First of all, with the introduction of the Fairy-type AND Primal Groudon, the special set from Gen 5 is no longer viable. There are no Sun-boosted Flamethrowers to throw around anymore, and Bug is currently one of the worst attacking moves in the game. As Dice mentioned earlier, since Sticky Web is dreadful in ORAS it can never revenge a healthy Geomancy Xerneas either, because any coverage move will OHKO (as will Moonblast after a tiny bit of chip damage). Primal Groudon hard walls Genesect, and while you can U-turn out on it early game it completely owns anything you try to do late game. Genesect has a much harder time punishing shit with switches nowadays because keeping hazards up isn't close to as easy as it was last generation; U-turn spam is FAR less threatening without Spikes support. Because it isn't a reliable Xerneas check, Genesect's newfound Fairy resistance is almost completely useless. I guess you bop CM Xerneas and Fairy Arceus but the former is rare and the latter is practically non-existent. However, the nerf Steel types suffered to Dark- and Ghost-type attacks cost Genesect2 of its 3-4 most important resistances. Now enemy Darkrai don't have to click Focus Blast in anticipation of a Genesect switch after it has slept something; it can simply spam Dark Pulse and severely punish any attempt to get Genesect in to revenge Darkrai or force it out. It also struggles badly to come in on a +1 Dark Arceus, whereas in Gen 5 it could come in and do ~65-70% with U-turn and force it to Recover (or force it out of the field of play entirely). Finally, it cannot Iron Head chain hax a CM Ghost Arceus to death nearly as often as it did before. Admittedly that was never a "reliable" way of dealing with Ghost Arceus anyway, but it worked often did it not???
Genesect's flaws outweigh its "strengths." Although Genesect still revenges Mewtwo, Rayquaza, Lati@s, Mewtwo-Y, and Darkrai, it cannot revenge a +1 Mega Salamence or Mewtwo-X. In fact, it gets annihilated by both. Unlike in Gen 5, where Genesect could revenge most common set-up sweepers when they are in U-turn or even Explosion range, Genesect cannot deal with the two of the most common sweepers in XY (xern and mence) and is only a mediocre answer to Extreme Killer Arceus. Also, LO Deoxys-A and LO Rayquaza are somewhat less common, giving Genesect less threats to revenge. Also, consider this: Genesect can only fit on offensive teams because it can't check much reliably for balance, yet it is MASSIVE Defog bait for almost any Arceus forme. If your opponent's Ghost Arceus can get in on Genesect after it has spammed Ice Beam or something to revenge a Rayquaza, you've lost your hazards. Genesect is forced to carry (and spam) Explosion on Deo-S HO teams for this reason...those teams absolutely need to keep pressure with hazards. Spamming U-turn every time Genesect comes in helps with this problem, but doesn't entirely solve it. For example, if the opponent has a Sash or Custap lead at 1% health on the bench and you have SR up, your Genesect is almost discouraged from coming in on something like Rayquaza or CM Latios because they can just sac their suicide lead and easily Defog with Arceus / defensive Salamence / what have you. Oh, using this exact same scenario they can also set up Geo Xern and potentially wipe out your entire team xD (since you're not running Genesect and Klefki on the same team).
TL;DR
1. U-turn spam less effective because this metagame isn't as hazard-centric
2. Less Pokemon it can reliably revenge
3. Primal Groudon exists
4. Can be taken advantage of in certain situations
5. Lost two crucial resistances
6. Genesect = bad
B- please