Although this somehow moved a bit far from the main story line, still I have to say I was pretty impressed with the story and how it was portrayed in lines. For me, it would be a bit better if the battle brought out within the story was specified more but its only my opinion, the author might be thinking of something even I wouldn't had thought about.
The blending of the characters was also a point worth reviewing. It is always good for a story to import a concept of polar opposites which in this story is portrayed by both Reshiram and Zekrom.

Pretty good there. Keep it up