Ok, by now you should know the handheld titles aren't anything to write home about. Yet we still have to rank the rest of the early 2000s. This time we saw releases among the DS, PSP, and a few GBA remnants.
2005 saw the releases of Dragon Ball GT: Transformation for the GameBoy Advance and Dragon Ball Z: Supersonic Warriors 2 for the Nintendo DS. 2006 saw the release Dragon Ball Z: Shin Budokai for the PlayStation Portable. 2007 saw the Dragon Ball Z: Harukanaru Densetsu for the DS and Dragon Ball Z: Shin Budokai - Another Road for the PlayStation Portable.
All of these are forgettable and should be filed as painfully average. The only standout title is Another Road. It played like a nearly portable copy of Tenkaichi. Having a fighter with tons of characters, decent mechanics, and visuals on the go? This helped it stand above the others. Still average though
2009 saw the release of Dragon Ball Z: Attack of the Saiyans for the DS. Now this was the best game on handhelds around this time. This was a well made RPG. It was the first in awhile too. It focused on one arc so the roster was small and time was spent of fleshing out the adventure. Fans found it fun and kids were content. Who knew a Dragon Ball Z RPG just worked? Thus this become a contender for our list.