There could easily be an excuse that zygarde at 10% or even 50% is not on the same level as other legends. If anything it would actually provide a reason why the legends aren’t curbstomping us. Every other character is walking around loaded with either god mode, magic, or a legendary signature Pokemon. While the main character us, though that’s debatable at this point has nothing except phione and kinda sillvally. What I’m saying is that it would be great if we got something anything to make the protagonist feel special compared to Mellia and the never ending barrage of legendary trainers with at least the weak 10% form.