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In Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness, there are ten different IQ groups that depend on a Pokémon's species. Depending on a Pokémon's IQ group, different IQ skills become available to the Pokémon.
List of Pokémon by IQ group
- Group C is the only group to contain a Pokémon of every type (other than the Fairy-type, which did not exist in Generation IV).