From The Bakugan Wiki

Flex is a Tag-Word Ability that was introduced in the first Bakugan: Geogan Rising card set, Secrets of the Geogan.


Cards with Flex allow the player to gain an additional effect if they have a card in play that costs 4 Battle Planet Energy Symbol.png or more. This can trigger off Baku-Gear, Evos, Flip Hero, Hero or Geogan cards in play.


There are no released cards with the Flex Tag-Word. It would have been featured in Secrets of the Geogan and GG.