What are your thoughts on the Zygarde forms? (Zygarde Core, Zygarde 10%, Zygarde 50%, Zygarde Perfect.)
I think the new Zygarde forms make Zygarde stand out from all the other legendaries. They seem to have gone and attempted to portray Zygarde as a "cluster" of smaller Pokemon that are controlled by a Core, giving a chance for some interesting lore. Zygarde perfect is the one that caught my attention the most; I imagine that it would have some gargantuan stats and ridiculous height and weight entries in the Pokedex.
How do you think Zygarde will change its forms?
Maybe through a fusion device like the DNA Splicer for the Tao Trio, but elevated to another level. The perfect form has patches of red on one wing/arm/whatever and blue on the other, which might imply a connection of some sort to Xerneas and Yveltal.
What do you think each forms Total Base Stat will be? Will Zygarde Perfect have 780 like Mega Rayquaza and Mega Mewtwo?
Core: 300-400
10%: around 500
50%: isn't this the "regular" Zygarde? 600
Perfect: 780. With a design that radical, I wouldn't be surprised if it does get the 780 BST
What role does Zygarde have? Do you think each form will have a separate role?
As the Order Pokemon, Zygarde's duty is to keep things in balance. It's Pokedex entry states that it unleashes its full power when an ecosystem is disrupted (come to think of it, could this be how it changes forms?). I think Core Zygarde and Cell Zygarde will be responsible for forming the physical structure of the Pokemon itself.
What are your thoughts on Zygarde cell and it not being a form of Zygarde?
Not really surprised, since it is known as the "cell". In real life, cells combine together to form an organism, and are not meant to be alternate forms by themselves. Zygarde cell might have a role that is similar to that, with the core acting as the "brain."