Look At The Second One's Head And The Black Tendrils - Tumblr Posts
So, first ever tumbler post, and its because of this whole thing here and my brain that picks out way too many details. Anyways, here is my thoughts on this:

This is most likely origin form Giratina, and I say so because of the much darker tendrils/wings the form has, and the headcrest that can be seen.

That is Palkia’s headcrest on his head, not Meau’s second spine! Meaning Noe is confronting the God of Space after having caught Dialga and Giratina, not Meau
So, my thought are Noe wants a domain of his own- since Dialga, Palkia, and even Giratina have their realms/spheres of influence, while Noe exists to remove mistakes/things that don’t exist- a destroyer, while the others all control/reflect integral parts of existence. Noe does not, and due to this probably wants one to call his own. Or maybe he just wants to control all three- Space, Time, and the Distortion world, all for himself. IDK, I’m not good with theories.
All art shown belongs to @phlurrii
Since I’m taking a break from the story stuff to keep my brain happy, (and because my stylus broke AGAIN last night during an insane shiny hunt the nerds) have a purposefully rough and vague clip of some very, VERY far off story beat we well not see for a while. I also guarantee the way ya’ll will interpret this will be wrong, if anyone gets it right I will be shocked, yet very impressed. Might even do a prize if someone guesses it correctly lol