Base 105 HP, Base 100 Defenses, Base 100 Speed, Base 125 Attack and... dear lord, the damage output is boosted by 1.5x? Even with Khan's already diverse movepool and the addition of Power-Up punch? Yeah, it's a pretty insane repertoire (especially in 454 Ubers, where it can outrun Xerneas and Yveltal).
Now, if someone can present a solid argument as to why Mega-Kanga shouldn't be banned, I'd be inclined to listen. But... sacking Ferro for prior damage and then attempting an RK with Talonflame? Come on guys, if your best plan involves letting something get KO'd so you can maybe, just maybe, get a revenge kill with a frail priority user, then you're effectively admitting that Kanga's broken. Having a dedicated defensive wall with a Rocky Helmet is just as ridiculous; besides removing passive recovery for when you have to deal with, say, anything else in the metagame,Kanga can carry Knock Off (edit: apparently, it can't. nbd). And if it doesn't, you can bet that something else on your opponent's team is; Gen 6 has made it quite viable.
In summary, Mega-Kanga's just too much. Most likely worth a ban.
Now, if someone can present a solid argument as to why Mega-Kanga shouldn't be banned, I'd be inclined to listen. But... sacking Ferro for prior damage and then attempting an RK with Talonflame? Come on guys, if your best plan involves letting something get KO'd so you can maybe, just maybe, get a revenge kill with a frail priority user, then you're effectively admitting that Kanga's broken. Having a dedicated defensive wall with a Rocky Helmet is just as ridiculous; besides removing passive recovery for when you have to deal with, say, anything else in the metagame,
In summary, Mega-Kanga's just too much. Most likely worth a ban.