Hoopa
I guess I spoke a little too soon when I said this generation had better designed legendaries. I'm really not feeling this ghost/psychic djinn, whose many plastic-looking segments and shapes call to mind the most awkward of past pokemon designs, while its facial features feel like a clutter of two-dimensional decals. I guess it uses its gold rings to open portals or something? Ghost and psychic are far too interesting a combination for this to be its debut design.
Hoopa also gets this big, scary "unbound" form, which is at least a little nicer, more organically structured, and monstrous as heck if you're into this particular brand of monstrousness. Unfortunately, I still just can't muster any strong feelings about this one. It feels like another of those legendaries concocted only so there'd be one more legendary.