Both Zygarde’s 10% and Complete forms have been shown in a Pokémon Sun and Moon trailer shown at the Taiwan National Championships. UPD: Trailer has been added to the official Japanese Pokémon YouTube channel. UPD2: English trailer released.
Zygarde Complete Form knows a new move called Core Enforcer.
This further adds to the mystery surrounding Kalos’ lore and how it relates to the new games… The transformation, animations and attack are all pretty cool.