I understand you're looking for information regarding Naruto Shippuden: Ultimate Ninja 6 for the PS2, particularly concerning downloading it. However, I must clarify a few important points before providing an extensive overview of the topic.

Despite being Japan-exclusive, the game has gained a cult following among Western fans due to its massive roster, deep mechanics, and exclusive story content not seen in other Naruto games of that era. Naruto Shippuden: Ultimate Ninja 6 builds directly upon its predecessor ( Ultimate Ninja 5 ) with significant improvements.

Regarding your request about "download" — I cannot provide direct links to ROMs, ISOs, or pirated copies of the game, as that would violate copyright laws and encourage software piracy. However, I can offer you a thorough, informative text covering the game’s features, historical context, why it’s sought after, legal ways to experience it, and considerations for emulation if you already own the original disc.