This game was great, I don't know why so many people are quick to dismiss it.
Other than its one small flaw, I have to say that this is a great game now and was amazing when it first came out for the DS. The fighting system and ability to bring in other characters at random moments reminds me of certain PS1 games early in the Dragon Ball series. It's simple while remaining great by making the most out of the DS. In fact in the newest game Dragon Ball Z Budokai Tenkaichi 3 they use a "dragon point" system used in this game where you make a team with a certain amount of total points and every character is given a point value, which I first saw in this game. Overall great game and if you can still find it, go ahead and pick it up.