The term "Guardian Bakugan" (original version Ace Monster (エースモンスター, Ēsu Monsutā) refers to the favorite or top Bakugan of a certain Bakugan brawler. There is a common misconception that "Guardian Bakugan" refers to talking Bakugan, as in actuality all Bakugan are capable of speech in the anime, with the exception of Mechanical Bakugan and Tentaclear as Tentaclear does not have a mouth. Due to limits of reality and technology, Bakugan with emotion (like Guardian Bakugan) are not able to be made in real life. It is however possible a "talking Bakugan" may be made with a voice box common to most toys.

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