How do you get Dark aura in Dragon ball z ultimate tenkaichi?

In "Dragon Ball Z: Ultimate Tenkaichi," you can obtain the Dark Aura by completing certain side missions or challenges during the game's story mode. Specifically, you may need to engage in battles against certain characters or complete specific objectives that align with evil or dark themes. Additionally, using characters with dark or villainous traits can increase your chances of acquiring the Dark Aura. Keep an eye on the game's rewards system for any specific tasks related to it.