Zygarde seems to be playing a key role, but it’s still a mystery

As the name suggests, Zygarde, the dragon/ground-type legendary who never got its own game as was tradition back in the day, will play a major role in Legends: Z-A. We see the Pokémon throughout the trailer in its dog-like form and there’s even a shot of one of its Zygarde Cells scooching throughout the city. But we don’t know what it’s actually doing as Lumiose City undergoes its renovations just yet.