If you're all wondering why the protagonists' Bakugans are in evolved forms, and not in originals, I was playing this on Battle Arena at Main Menu. Also, I didn't have the time to finish the rest of the walkthroughs and battle them in the park to unlock their respective Bakugans.
It makes sense why you thought these were the coolest thing. The anime and the way it presents pretty much everything was to make you want to buy the game despute the fact that the game of bakugan in really is very unstylish.