it be nice but i think we will never get the Dragon
Why not? We got the master of Gen 1 legendary birds on Gen 2 (Lugia)
Wasn't that in the movie only? Also, the original Dragon was probably just a plot device anyway. If something was related to the main cover legendaries, it would have been covered in those games. This may not be as important but it's BST is also a problem. If Kyurem's BST increased by 40 by fusing with one dragon, fusing with the other would make it more than Arceus. What type would it be anyway? Pure Dragon?