From Bulbapedia, the community-driven Pokémon encyclopedia.
Keldeo has been featured on 6 different cards since it debuted in the Keldeo Battle Strength Deck of the Pokémon Trading Card Game. Keldeo cards are normally Water-type Basic Pokémon. In Japan, Keldeo was featured in the Keldeo Battle Strength Deck released in April 2012.
List of Pokémon cards featuring Keldeo