First seen on March 1, 2015, a low-resolution cell-phone picture of an upcoming issue of CoroCoro magazine was leaked around the Internet. On March 4, the magazine was officially released and the game was also officially confirmed on Pokémon Smash! XY by Junichi Masuda, and subsequently the official Japanese and international Pokémon websites. The game was released worldwide (except for select countries) on December 19, 2015.
Explore Nintendo Network Plaza, an enhancement with new games!
Fight at the Battle Frontier, a challenging tournament area featuring Kalos' best trainers!
Trade with X, Y, Omega Ruby, and Alpha Sapphire, to catch 'em all!
Compatible with Pokémon Battle Blitz for the Wii U!
Changes from Pokémon X and Y
Calem, Serena, Shauna and Tierno have different outfits designed for hotter weather, as the entire Kalos region has changed in temperature.
Some of the moves have been redesigned. For example, the paw print replaces the fist.
When the player starts the battle with the Zygarde in the Thousandth Dimension, instead of displaying "Zygarde appeared!", it displays "The Thousandth Dimension's Zygarde appeared!". It is referred to as "the wild Zygarde" in other instances, such as attacking, however.
Like Black and White, the player will not be battling the Champion of the Kalos region after first defeating the Elite Four, unlike previous games. Once the player enters the Radiant Chamber, Lysandre is seen triumphantly boasting over Diantha. Zygarde, the mascot of Z, then phases into the world in front of Lysandre.
A new area known as the Thousandth Dimension is playable. It has floor-like sections floating at ninety-degree angles from each other. It disobeys the Law of Physic, making things like surfing down a waterfall going up possible. The camera angle switches between perspective and isometric views to suit the angle of the player. It also has moving platforms with jumpable gaps between them. Zygarde, when here, will be in its Kai Forme and is also the only wild Pokémon located here.
Once defeated, Boone angrily intervenes, revealing his intentions of creating Team Flare for his own interests of power, and how Lysandre and the idea of making a beautiful world were merely her tools. In a rage, he battles the player in an attempt to eliminate any witnesses of the truth. After defeating Lysandre and Boone, however, the game is not over, as there are further activities to be done.
Eight new characters to the main storyline were added. Seven are the Seven Goddesses of Team Flare, including Boone, the main antagonist of Z, and the other is Hezikiah, a scientist who helps the player stop Team Flare.
Zygarde's cry will be heard when "Start" is pressed at the title screen, unlike in Pokémon X and Y, which just play a snippet of the title theme's melody. It shares this trait with some games from previous generations.
The Life and Destruction Crystals must be found in a cave somewhere in the Glittering Cave. To be able to catch Xerneas and Yveltal, the player must have obtained the items in that cave and must have faced Zygarde, whether it was caught or not. Then the player can go to Team Flare Secret HQ.
Zygarde can appear both as Normal Zygarde and Kai Zygarde in Z. It will appear as Kai Zygarde while in the Thousandth Dimension, and as Normal Zygarde while out of it. An Armageddon Needle is required to transform it into Kai Zygarde outside of the Thousandth Dimension.