A new form for the legendary dual-type Dragon/Ground Pokemon has been confirmed for Pokemon Sun & Moon. Video of the “Complete Forme Zygarde” was leaked online along with 10-percent Forme Zygarde. Watch it above.
According to Bulbapedia, Zygarde Complete Form was announced in the October 2015 issue of CoroCoro, along with Zygarde Cell, Zygarde Core, and Zygarde 10% Forme.
Zygarde 50% Forme is the form of Zygarde that was available in Pokemon X, Y, Omega Ruby, and Alpha Sapphire.