Just a small post about some arguments here.
There are still people who think that HO will become as dominant as before with the bad, bad Aegislash ruining the great meta we have.
As I mentioned before, there are no members of these HO-teams besides Bisharp and Aegislash left. Deoxys, the perfect lead, is gone. Lucario and Mawile, the strong wallbreaking and sweeping megas, are banned. Landorus is broken anyway and keeping it would be stupid anyways. Greninja, the fastest balance-breaker is no more. Do you really think, that Bisharp and Aegislash ALONE can lead to an aggressive fast HO-meta? Not to mention that we got excellent checks to HO in form of Lopunny and Sceptile, so I really don't see that playstyle as dominant as before. Thundurus will not become broken and I and others already explained Charizard X.
As a response to
Kurona's post (don't worry, I won't nitpick your Rayquaza-example):
Not all of us see Aegislash as the "better poison". I for myself believe that a meta with Aegislash is healthy and better than the current one. Every meta needs something it centralizes itself around otherwise it will become a huge mess. If you look at other metagames like Super Smash, you will realize that even this game has centralizing aspects around fast and rush-down characters, but that doesn't mean that only these ones are good. Currently, OU has nothing it can shape around and if you look closely you will see how much of a mess it really is. People were suggesting special Tauros to deal with threats, which is not the greatest idea but it still worked for them. There were so many ridiculous D-rank nominations in the past weeks despite most of them being horrible they could use them to success. I know that this is happening quite a few times but not to this extent. You can call that creativity but people are desperately trying to build team that will not loose every third game due to match-up. This is not healthy and I honestly can not understand how some people are claiming that this meta is actually "pretty balanced".
XY-meta is different from ORAS-meta, and having so many threats already banned and new checks to HO and Aegislash, I do not believe that Aegislash will be some sort of better poison, it will be a healthy and positive centralizing aspect of the metagame.
One more thing I would like to explain is why some people are saying that we have "staleness" in this meta despite having more viable Pokemon than ever.
Let me ask this: When was the last time you saw a Mega-Beedrill? Or a Mega-Aerodactyl?
Only a few are still using them because in this matchup-meta it is better to stick to the already working as it will have more success most of the time. You almost always see Metagross and Altaria and occasionally Charizard X, Slowbro and Scizor. I'm not saying nobody uses all the other megas but it is undeniable that they are not as common as they should be.
One little side-note:
There are so many posts how they dislike the new ladder.
This ladder is new, people are still experimenting. Basing your opinion JUST from the current trends is not a good idea. You can use it as a help to understand the suspects perfomance, but don't base your entire argument on this.