Hm... I've been thinking about this for a while now, and just recently I have been trying to research stuff about the Opening Cinematic in Black Version 2 and White Version 2. It very much seems like it uses the same type of method as what Pokémon Black Version and Pokémon White Version Opening Cinematic uses.
Alright, so here's what I've done. I've tried to look through every single folder in the a folder along with the numbered folders and NARC files. And so I was expecting to find some NCGR, NCLR, NANR, NCER and NSCR files in there or some BTX files. But it seems as if I can't find any of them. I still wonder to myself "where are they?!", I even wonder to myself if some of the binary files in the NARCs that have no extension host the images for the opening cinematic screen.
What I'm aiming to do with editing the opening cinematic... is change the Japanese logo into the English one at the near beginning of the animation, even maybe I might also see about taking advantage of doing this with a Pokémon Black Version 2 ROM hack I'm planning, called Pokémon Lava Ruby.
If we can find any information about where the data for the opening cinematic screen is, please be sure to post about it here, and also this thread can also be used for posting information about the opening cinematic screen, and what format it uses and stuff like that, in which can help other ROM hackers with their NDS editing.
So it could even be useful for other games as well, Pokémon Black/White/Black 2/White 2 are probably not the only ones that use it.