I personally believe that Mega Kangaskhan is extremely broken, and every team needs to run a counter just for this. As a result, it is my belief that...
IT SHOULD STAY IN OU.
Yes, really. Let me explain.
The reason being that it uses up your Mega Evolution slot, and by banning it, you overcentralize the metagame again. Think about it. Before Gengarite was banned, everyone used their Mega Evolution slot on Gengar, with a few using it on other pokes. Gengar was the best Mega (besides Mewtwo/Blaziken, which are ban-worthy even without Mega Evolution).
Then Gengarite was banned, so everyone who did have Mega Gengar on their team switched to using other Megas, most notably Mega Kangaskhan. The gameplay of the tier has shifted. Rather than trying to counter Mega Gengar, everyone just shifted to countering Mega Kangaskhan instead. Because that is what became necessary.
If Kangaskhanite is banned, then who's to say that these same people won't switch over to Mega Lucario (great attacking stats and Adaptability) or Mega Mawile (105 Huge Power!) or Mega Medicham (a better movepool and is faster than Mega Mawile, albeit less bulky)? Heck, even Mega Heracross probably gets enough use to the point that it's (probably) not going to be in UU. And we just ban Mega Stone after Mega Stone until there's nothing left. Mega Evolution, which is supposed to be the gimmick that separates Gen VI from Gen V, will be regulated to Ubers-only play before too long.
I worry that if we go ban happy on Mega Stones, we open up this very real possibility. And thus, this new gameplay mechanic will go largely unexplored (as a majority of users prefer to play OU over Ubers). And since this is something that Smogon has no history of dealing with, I feel that we should think about this before jumping to any conclusions.
Is Mega Kangaskhan broken, even for a Mega? Maybe. But until we do more extensive testing on Mega Evolutions, I don't think that we can say that for sure, so I don't think that the Kangaskhanite should be banned right now. Maybe after a suspect test, I will be proven wrong. At that point, I will no longer object to the ban.
This is not a valid argument. We do not ban things based on their usage. We ban them based on how broken they are and how much they change the metagame. Mega-Gengar was broken. It completely dominated teams, and ruined entire play styles. That got it banned. If, in fact, Mega-Kangaskhan's usage increased after the Mega-Gengar ban, so what? No one has to run a Mega-Evolution. The only reason Mega-Kangaskhan is receiving so much usage is not because it is the only viable Mega-Evolution, but rather because it is overpowered as heck, and there has been a reduction in competition for overpowered Pokémon (which is
NOT the same thing as a reduction in competition for Megas). Ban Mega-Kangaskhan. Ban Mega-Lucario if it's broken (not advocating that, just using it as an example for this discussion). Do you think anyone is suddenly going to pack their teams with Mega-Manectric or Mega-Houndoom, even if those two were the only Mega-Evolutions left? No. Because they aren't broken. Even if Mega-Kangaskhan was banned, we would
possibly see Mega-Lucario up for a ban, and no other Mega-Evolutions.
Do you know what else gives evidence against this argument? The fact that all three of these Mega-Evolutions (Gengar, Kangaskhan, and Lucario), all had people calling for bans, even before Mega-Gengar was first considered. Mega-Kangaskhan is not being considered because we got rid of Mega-Gengar. It's being considered because it is broken, overpowered, and dominates the metagame.
And, frankly, the argument "why are we letting such an interesting new addition to the mechanics go to waste" is, again, a bad one. Yes, it's new. Which means, like 90% of the new additions to the Pokémon series, it is unrefined and unbalanced. We'll undoubtedly get more Mega-Evolutions (we already know the Mega-Lati@s are on the way), and I'm guessing we'll get refinements to the ones that currently exist as GameFreak realizes just how idiotic some of the decisions they made were. Sure, we all know that GameFreak never retroactively changes a... Oh, right, Steel type versus Ghost and Dark. Shadow Tag Chandelure. Just to name two right off the top of my head, among countless other changes made this generation. Even if we did ban every Mega Stone (and note that, despite your claim, the only one which might possibly get banned is one which is already being called for a ban), so what? Smogon is a competitive community. If the Mega Stones unbalance competition, they should be banned. Ingenuity and innovation is only welcome as long as it benefits a healthy, stable, and competitive metagame.
Seismic Toss will do only 150 in Lvl 100 battles and 75 in Lvl 50 battles.
I believe that Mega-Kanga should stay in OU. Unlike cousin Mega Gengar, you actually can switch out into another Pokemon, and your not locked into any Shadow Tags. If you play your cards right and your team is built to counter a significant amount of the new and old threats of OU, I don't see why he shouldn't be allowed in this tier. Sure, you can say "omg he's broken he hits twice", and yeah his Atk is pretty high, but with the right support there are ways around him. Every team should be prepared for strong hitters, not just M-Kanga. Ghosts, Substitute, Rough Skin/Iron Barbs, Rocky Helmet, PP Stalling, Status (burn/toxic/twave/sleep) and even Entry Hazards easily deal with M-Kanga. If you have a problem with Mega Kanga, I suggest you spend a little bit more time in the teambuilder tab.
The mechanic is this: Parental Bond cuts the Base Power of the second move in half. Thus, on the second hit, Power-Up Punch is using 20 BP instead of 40. Seismic Toss does not use BP, but rather has set damage. Therefore, it is immune to the damage-reduction, until such time as GameFreak chooses to adjust the mechanics.
Also, I just want to say, if I see one more person saying that Substitute does anything against Mega-Kangaskhan, I am going to scream. Substitute is worthless against him. Is there
any Substitute in the game that will not be broken by Mega-Kangaskhan's first hit?
I actually have never had to build my team around countering this thing, as my favorite spin blocker, Dusclops handles this guy like a beast, and honestly, it's not too hard to predict khans moves and switch in a ghost type, especially with defensive ghosts like Confagrius and Dusclops. I've only had a khan get a +2 off once, and then i easily revenged it with choice banded mach punch conkledurr. We ban things to Ubers based on their ability to disrupt the OU metagame, like mega Gengar who was banned Not because of it's sweeping ability, but it's ability to trap and kill checks and countersto allow something else to sweep.
Actually, there are several banning criteria. Mega-Gengar was banned under the Support Criteria. There is also a criteria for Sweepers, as well as one for walls. Supporting other team members is not the only way a Pokémon can be banned. Do you really think that Deoxys-A or Xerneas were banned because of their incredible team support potential?
Scrappy khan can't do anything worthwhile with normal Khans stats. Its not realistic. I can switch in any moderately bulky ghost, take anything from it, and burn it with ease crippling it, and sometimes for fun cursing it.
It can hit ghosts with Power-Up Punch, which is all it really needs to do. After a Power-Up Punch, can you name a ghost that won't get one-shotted by Mega-Kanga's Crunch?
And, again, ghosts are not that common.
If the checks are taken off the field in any match, anything can sweep. Thats a redundant point. Khan should not be banned because, while it is quite powerful it does not break the metagame in the way M-gar did, WHICH WAS NOT FOR IT'S SWEEPING ABILITY, but for it's shadow tag trapping ability. Same with Lucario. Rocky helmet on any defensive check has always been common, not centralizing. it's about as centralizing as rain Keldeo. Which is arguable responsible for bring gastrodon into Usage. Something funny, if you give anything set up it crushes. So please stop assuming it gets set up. It reminds me of cloyster: Decent bulk, and demolishes when you set it up, but weak to priority.
Can somebody present a legitimate argument proving that M-Khan is OP without factoring things like set up, which is pointless to bring up because if anything sets up it wins. DD dragonite for example. If you let a D-nite get set up without touching it, which is what most people on this thread are suggesting khan can do, D-nite sweeps. So does Khan. The closest thing i see to a legitimate argument is when people bring up the calcs of how Khan can kill things after setting up with massive power, and then talking about how it's bulk allows it to be uneasily revenged. But how would this thing get a plus 2 without taking prior damage? Against a decent player, IT WOULDN'T, allowing it to be revenged by most priority, especially with most priority users being resistent to suckr punch. The opponent would have to be stupid for that to happen. The rest I can see so far is people whining "LOL OP" Thats it.
You're right, it doesn't break the metagame in the same way Mega-Gengar does. It breaks it in the same way Xerneas does. Or Deoxys Attack does. Or Kyogre does. It breaks the metagame by completely destroying pretty much the entire OU tier all by itself. It breaks the metagame by forcing people to run multiple counters to it (which will wind up with the Mega-Kangaskhan player winning just because the match becomes 3 on 5, at best, after Mega-Kangaskhan and its counters are out of the way).
Also, there is a reason which has not yet been brought up as an in-depth point of discussion, but which I feel deserves to be mentioned. Kangaskhan is the most pathetically easy Pokémon to use in the current metagame. There is no strategy, there is no thought. This is really the only Pokémon that you can just rip a set straight from the analysis, throw it into any situation, and still pretty much win. You just run your attacks and Power-Up Punch, and you achieve victory. Mega-Kangaskhan is going to kill at least one Pokémon, even in the worst of circumstances, being used by a player with no thought or skill at all.