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Weakness is a factor in Bakugan: Rise of the Resistance.
This part of the game plays a crucial role when brawling against a certain opponent. For example, if you are battling General Phobos (who is a Darkus Brawler) - you should pick someone who uses an attribute that is strongest against Darkus. So, when battling against Darkus, you should use Haos since it is the direct opposite of Darkus.