From The Bakugan Wiki
EV is the fifth Generation 2 secondary card expansion, and the first of Bakugan: Evolutions. It exclusively contains Geogan, Nanogan, Evolution, and Character Cards, and has no full name. As a result of the cancellation of the Trading Card Game, EV cards are only available in conjunction with their respective toys.
List of Cards in the first Bakugan: Evolutions card set