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An entire post-game quest dedicated to collecting Zygarde Cells and Zygarde Cores, and all we get are 2 (TWO) new formes and 1 (ONE) old forme. Seems like a big waste of potential, so lets grab our old Norse Mythology books (or just Google) and make up some new Zygarde formes to flesh out the mechanic.
Here's Zygarde 10%'s Pokédex entries, for inspiration:
>This is Zygarde’s form when about 10% of its cells have been gathered. It runs across the land at speeds greater than 60 mph.
>Its sharp fangs make short work of finishing off its enemies, but it’s unable to maintain this body indefinitely. After a period of time, it falls apart.
I'll start:
Zygarde 5% - Cat Forme
>This is Zygarde's form when about 5% of its cells have been gathered. It uses this form to escape danger with ease.
>Zygarde can transform into this form in the blink of an eye. It can always land on all four feet completely unscathed no matter from how high it might have fallen.
Based on the cat Jörmungandr (Zygarde 50%) was transformed into by the Giants in order to trick Thor into losing a strength contest.