Following the CoroCoro leak last week, The Pokémon Company International has released official information regarding the mysterious legendary Pokémon, Zygarde. The official release confirms the rumours that Zygarde consists of an enormous number of cells, attaining more power when more cells congregate. It also cements Zygarde as the “guardian” of the XY trio, as Rayquaza was to Groudon and Kyogre back in Ruby and Sapphire.

Zygarde Cell: This stage has been identified as the single Cells that make up Zygarde. Cells do not possess any will or thought processes. They’re found scattered throughout the region. Since they can’t use any moves, researchers question whether they can even be called Pokémon!
Zygarde Core: At this stage, this aspect of Zygarde is little more than a part of the Pokémon’s brain. Unlike the Cells, the Cores are self-aware and can communicate with Cells and other Cores via telepathy. When a change occurs in the local region’s ecosystem, Cores have been known to take action.
Zygarde 10% Forme: Zygarde 10% is the Forme that the Zygarde Core takes when it gathers 10% of the Cells nearby. Capable of traveling over 60 mph (100 km/h), it defeats enemies with its sharp fangs and its incredible speed.
Zygarde 50% Forme: This Legendary Pokémon watches over and maintains the local ecosystem. Until recently, this was the only known Forme of Zygarde. In actuality, this Forme only has 50% of the Cells in its structure.
Zygarde Complete Forme: This is the perfect Forme that Zygarde takes when the Core gathers 100% of the Cells. When the ecosystem is under threat, and the Core concludes that the 50% Forme will be unable to deal with it, the Core takes on the Complete Forme. Its power is said to be greater than that of the Legendary Pokémon Xerneas and Yveltal.

The release also mentions the aptly named Ash-Greninja. This is a special forme of Greninja in which it reflects the appearance of its trainer due to the strength of their bond. The information alludes to previous occurrences of the same phenomenon in the Kalos region, but the specific details remain unknown. In this case, the Greninja in question is assuming the appearance of Ash’s attire.

Greninja-Ash
Ash-Greninja

No word has been made yet of an appearance in the games as of yet, but it is reasonable to assume that they will be made available as a movie tie-in for the upcoming release of Hoopa and The Clash of Ages. While Greninja isn’t exactly in need of a competitive boost, it’s an interesting aesthetic twist. Zygarde, however, is lacking presence in the metagame, particularly for a legendary pokemon, so a boost like this will be very exciting to see.

Source: Serebii