I keep on wanting to find something to say about the way you've shown the reverse world. I find it's just too alien. I can't really explain what I see. I know that it's beautiful and strange, and looking at it too hard makes me feel like I shouldn't be looking at it. It's like one of my favorite Star Trek novels, Eye of the Beholder.
Given what you're portraying, that's exactly the reaction I should have. Giratina and the World are just two rationals thing my mind can pull out of something too strange for it to understand.