cocowoushi said:Okay, having some time to have this sink in here are my thoughts:
The boy in the cap will be (one of) your rival/s, as he claims "I will surpass the champion." However, there's something noticeably menacing about him (probably the goofy hair, pale complexion). Not to mention he bears a slight resemblance to the clearly villainous figure with the red eye and golden artifact. Father/Son relationship perhaps? Brothers?
Also, our Rival is wearing a cap too, similar in style to our protagonists. Before the VS match with Cheren and Black, the room they are in has recently been terrorized by a pokemon. You can tell by the footprints on the wall. I don't believe Cheren is a rival, or a Gym leader, but guessing by the small amount of clothes we see, they look like an officer or maybe someone like Looker was in Platinum. Our Rival is actually working for the bad guys and is what caused the chaos in this room. Cheren runs in to investigate but mistakes you as the thief instead.
This probably happens more than once, as you're more on the trail to track down and stop your Rival, who always seems to leave before Cheren shows up, leaving you to battle them instead. This explains why Cheren has their own VS sprite, and why they're not directly in front of you when the battle starts.
The golden object the Villain guy holds looks like a crown, but I actually think it's the top of a torch of some kind, to tie in with the whole fire thing Reshiram's got going on.
And I'm going to guess the bit with the roller coaster is part of a Gym. An Electric type I'm hoping - with what looks like a female leader. (She's got blond hair so it certainly fits the trend!)
Hey are the person who also posted this on serebii? At first I thought someone else thought of something similar but it is the exact same theory. Anyways I thought this was a good idea. Very well thought out.