October's CoroCoro has been released and confirms Mega Evolutions for Tyranitar and Aggron. Mega Tyranitar stays Rock/Dark type and keeps its Sand Stream ability. Mega Aggron on the other hand loses its Rock typing to become pure Steel type. It also has the ability of Filter (which reduces damage from supereffective attacks).
The magazine also confirms Mega Gengar which was revealed by leaks (Ghost/Poison; Shadow Tag ability) and Mega Kangaskhan which was revealed at the Pokemon World Championships in August.
In other news, Pokemon X and Y are only a day away! We've been keeping the site updated with all the latest information such as Pokemon, moves and abilities. Check out the links below if you don't mind spoilers: