All moves have exactly one type each. The type of a damaging move typically determines which types of Pokémon it is super effective against, which types of Pokémon it is not very effective against, and which types of Pokémon it is completely ineffective against (with very few exceptions).
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In Generation 2, Dark and Steel types were added, while in Generation 6 (Pokémon X and Pokémon Y) the Fairy type was added. Below are the differences compared to the current type chart.
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