So I'm sure most if not all of you guys have played or watched the whole Sun and Moon game and story, and something that left me a bit disappointed was Zygarde. Back during E3 I believe when Zygarde 10% and Complete was talked about they said that he'd be a part of the story in a unexpected way. Well they were right as in he wasn't involved at all! All Zygarde was, was a side mission and nothing else just something optional. After thinking about it for a while I came up with a story part which would have worked amazingly well! So when you receive the Cube you receive it with a Core and your job is to find the Cells but you can only find up to 50% of them but it isn't told you that it is only 50%. You progress through everything until the final Ultra Beast Gluttony, there right before you reach the cave your way is blocked by the character who gave you the cube and will only allow you to progress if you have all the Cells (50% for now). Once you do you can advance into the cavern where a cutscene will start and you see Gluttony chasing another Zygarde Core, the player goes to protect the 2nd Core and the cube activates and your Core appears then both Cores will Summon all the Cells and become Perfect Zygarde! Then the battle starts of Perfect Zygarde vs Guzzlord! After you either catch or defeat Guzzlord the 2nd Core will leave and on a later date you can return and have it join you (or battle it as Zygarde 50%, personally I'd prefer to battle), then you can use the 2 Cores to create Power Construct Zygarde.