Bakugan City is a place that shown in the second arc of Bakugan: Mechtanium Surge.
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In Evil Arrival, an evil Mechtogan named Coredegon and other rogue Mechtogan attacked and tried to take over the city. However, they were defeated by Drago's Dragonoid Destroyer.
In Wiseman Cometh, Wiseman brought and freed all the Nonet Bakugan to try take over Bakugan City. However, they were defeated again with the help of Dragonoid Destroyer.