The expansion sheet series released by Bandai's Jumbo Carddass consists of a single sheet featuring cards, damage counters, and status condition markers. In the third instalment of the series, instead of damage counters, "Extra Cards" were included on the back that couldn't be used in the card game. "Oyama's Pikachu" is a special Pikachu card designed by Pokémon illustrator Kouichi Ooyama, and only one of its kind exists.