Don't teach us what is our role as Ubers moderators and leaders. If you can't bear a tier where everything is allowed - quit it. I do understand the concern about Xerneas being really strong but neither you and we know enough of the metagame to even start talking about it. The Ubers metagame, as an ideal, is a tier where absolutely everything is allowed, besides your standard clauses.
Please calm down, I didn't plan to teach anyone anything and it wasn't my intention at all. I only said it out of concern and I answered people wanting to ban Xerneas, because banning Pokemon because of POTENTIAL one move is really controversial (especially in Ubers, where it never happened). It's your decision guys (and potential voters) and I never meant to say otherwise (I said that it depends on you, I have nothing to do with it). You didn't need to be so harsh about it, but if it offended you somehow, then sorry. Yes, I realize that Ubers is metagame where everything is allowed (and I never said otherwise), not counting standard clauses. And I also clearly said that we need to wait and see how it's gonna work out, so actually I was calming people down which were ban happy, because so far (on paper) Geomancy set may be a huge deal especially if it gets Earth Power. And you said Palkia as comparison - Palkia is much easier to revenge kill (the only thing Palkia has to 'increase' her speed is Trick Room) and sets which has no problem with speed (Scarf) are pretty easy to handle as it doesn't have raw power to get through stuff like Chansey or Ferrothorn, while against Specs you can work around with switching on resistances (although Hydro Pump in rain hurts like hell, but there are still water immunities) and offensive teams can easily revenge kill it with base 100 speed (and dragon moves being EVERYWHERE), which is decent, but not great by any standards. While Palkia indeed doesn't have 100% pure counters, she is checkable by anything faster and as long as you have hazards up, stall can deal with her with smart switching (or slap one scarfer if needed which can hit her really hard, preferably with dragon move). I wouldn't really compare Palkia to Xerneas as Palkia have no boosting moves outside of Bulk Up and no way to increase her speed outside of Trick Room and 0 IVs in Speed. And after Geomancy Xerneas is extremely fast (and if his base speed is 99, it may be really hard to find any scarfer which can not only outspeed, but also KO it back) as Fairy is also really damn great defensive typing (weaknesses only to Steel and Poison, types which are... uncommon and meh offensive typings outside of hitting Fairies) and Xerneas is also to make things worse. Being fast enough to outspeed all good scarfers ? Check. Having the ability to 2OHKO technically everything after Geomancy ? Check (even pink blobs won't enjoy +2 Focus Blasts). Having bulk to survive pretty much all hits at good health (and GREAT typing to back it up) ? Check (maybe Choice Band Meteor Mash from Metagross can KO back, I would need to check, but I may safely assume it does). I would say that Geomancy Xerneas looks far more scary then any Palkia set no matter how I look at it as after Geomancy is it far faster, bulkier (especially on special side, and this typing is perfect to take hits) and powerful then Palkia. Psystrike MewTwo is also a nightmare to stop, but 130 speed is still prone to revenge killing (scarfers), decent but not great bulk and there is still stuff which can check it with solid comfort even if it is niche (Dark Arceus, Psychic Arceus). As ironically it sounds Ubers right now is somewhat... balanced, as everything can be somewhat stopped (in more or less effective way).
Yes, it never happened, but without raging, insulting, etc. what would happen if Xerneas indeed ended up unstoppable clearly having not even reliable checks (I don't call counters, as demanding that in Ubers would be somewhat strange, when MewTwo, Rayquaza and Palkia doesn't have those and few others, etc.). With Earth Power so far I see only Specially Defensive Bronzong. Yes it would be precedence and we all want to avoid it (yes, me as well), but if one Pokemon because of one move would totally broke the meta (of course I hate calling ban hammer, especially in Ubers) would you consider it or you would stick to no-ban rule no matter what, even if it ruins somewhat really shaky balance ? I really like Ubers and it's still totally playable meta (even if it is just a ban list without any plans to balance it by any means) with defensive/offensive titans somewhat balancing each other out, no matter how strangely it looks. Please answer calmly, without harsh comments. Thank you. Yes, I said all of this out of concern, as yes, I am worried, that's all, because i like Ubers metagame. Especially if we can't reach the ideal situation which we all hope for.
But as I said - I just speculate, as in the end my concerns may end up as a total fail thing.
EDIT: Point taken and thanks for answer. I won't talk about this anymore, especially as our knowledge about Ubers XY is so limited now.