The last, the best.
This is not only because of the addition of a few new systems such as the Cross and Beast-Out but also because of it's more exciting and enticing storyline that makes a devoted player more and more addicted to it. Unlike the set story present in the last two series of the game, which involves either Tournaments or Liberations, this game does not give anyone the chance of knowing exactly what would come next.
Fresh new systems such as Crosses, Beast-Out, Virus Battlers and new Battle Chips just make the game better and better. In it's two predecessors, "Megaman Battle Network 5" and "Megaman Battle Network 4", a Soul Unison system allows one to merge with a particular friend Navi by sacrificing a particular Element's chip. In this game, it has been replaced by the Cross System which allows the player to merge with a friend Navi by merely selecting it from the Custom Screen, free of cost. The Beast-Out is a newly introduced system that powers up Megaman.EXE by awakening a portion of the Cybeast's energy stored in the massive energy banks built inside Megaman. One may also activate a Cross and a Beast-Out together for more destructive power. Finally, the five Virus Battlers scattered in the game permits the player to battle wild Viruses with Viruses that he/she has caught!
A very noticable fact is how easier it has become compared with the former games. Bosses and Navis, as well as Virus have become easier for familiar gamers but they might still prove to be a challenge for less experienced battlers.
The graphics of the game has advanced slightly while the sound trails far behind. Sounds during gameplay have never been extraordinary in any of the Megaman series. A quite disturbing fact is that the "Distress Sound" which we come across during one disaster or another in the game remains after the game is beaten. Gameplay is good and the value has risen in my oppinion.
In all, I would say that this is an exceptionally good GBA game and I would strongly recommend it to gamers of all ages. Finally I would thank the makers for making this game so enjoyable!