<P> A simplified type system was adopted from the video games for use in the trading card game . Instead of 18 types of Pokémon, only eleven exist in the TCG . Seven were introduced in the Base Set (the first ever set of Pokémon cards); Darkness and Metal types appeared when Pokémon Gold and Silver introduced the Dark and Steel types in the video games; the Dragon type was introduced in the Japanese Dragon Selection set; and finally, the Fairy type was introduced in the Japanese XY set to correspond to its introduction in the video games . </P> <P> Most Pokémon have only one type, three exceptions are EX Team Magma vs Team Aqua which introduced Dual - type Pokémon that have two different types, XY: Steam Siege, and the Heartgold / Soulsilver era sets . Dual - types were utilized in Pokémon LEGEND cards, to emphasize the multiple Pokémon the mechanic has in the Heartgold and Soulsilver sets . In August 2016, the Steam Siege expansion from the XY Series reintroduced dual - type Pokémon, this time with regular Pokémon being multiple types as well as EX Pokémon . </P> <Ol> <Li> ^ Starting with the Diamond & Pearl expansion, Poison - type Pokémon in - game are now Psychic; they were previously Grass . </Li> <Li> ^ Starting with the Black & White expansion set Dragon Selection, Dragon - type Pokémon in - game are now Dragon; they were previously Colorless . </Li> </Ol> <Li> ^ Starting with the Diamond & Pearl expansion, Poison - type Pokémon in - game are now Psychic; they were previously Grass . </Li>

What are the rules of the pokemon card game