Banned Card
From The Bakugan Wiki
Banned Cards are cards, or sets of cards, that were not usable in competitive brawling formats. While there were not any strictly banned cards in North American formats (i.e. Baku-Con), the Japanese competitive scene had some restrictions, such as restricting certain Gate Cards, and Ability Card combinations.
North America
There were no major restrictions in the North American scene. The only restriction was during the 2010 BakuCon, where HSP Cards were limited to only cards with positive attribute bonuses.
Japan
For the Japanese official brawling events, there were some restrictions on cards that could be used in play.