There's been a big hint for Pokemon Z given - the Dragon/Ground legendary
Zygarde that resided in the postgame of Pokemon X/Y now has multiple forms.
-The mysterious green blob, which was first seen in a teaser at the end of the 18th movie in Japan, is known as Zygarde Core. It is the mind of the new Formes, when it fuses with multiple Zygarde Cells.
-A flat version of Zygarde Core is called Zygarde Cell. It was previously seen in a trailer for Mega Evolution Special IV, although it had been assumed to be the same as Zygarde Core.
-The new dog-like Forme of Zygarde is at 10% power, and is called Zygarde 10% Forme. It is said to have razor sharp teeth and speed.
-The previously seen Forme of Zygarde is said to be Zygarde at 50% power, and is called Zygarde 50% Forme.
-The gargantuan Zygarde is called Zygarde Perfect Forme. It is the System Pokemon and has a height of 4.5 m and weight of 610 kg. It is Dragon/Ground-type, like Zygarde 50% Forme. This new Forme of Zygarde is said to exceed both Xerneas and Yveltal in power.