Phi-Bi

with zen mode, the pokemon revert back to normal form when its hp is above 50% so it's kinda redundant to change form. Hope GF fix this also or at least Power Construct doesn't get that treatment.

does power construct trigger at 50%? if so thank good the trailers made it look like 10% or something insane like that

According to Bulbapedia, yes. It triggers once zygarde hp falls below half, that's insane (in a good way) tbh