If you are asking if there is a way to get 100% Zygarde, then Yes, you can. You start your Cell-capturing journey, with the Zygarde Cube given to you by either Dexio (Sun) or Sina (Moon). Then, you get 10 cells to form into Zygarde 10% form. Next, you find 40 more cells to form into Zygarde 50% form, the one we know from Gen 6. Finally, you find the rest until you have successfully found all 100 cells to form into Zygarde 50% form with the Power Construct Ability. You can go to Route 16 at the Aether Base to do this formation. In order to get 100% form, have Zygarde w/Power Construct lose 1/2 half.