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The only members of the Indigo League who admitted to specializing in a type were Will, Karen and Lance. Although some of them talk about their tactics and in doing so implicitly reveal a favoritism to a particular type (Koga, Bruno, Lorelei). But no one directly says "Agatha is the Ghost trainer of the Elite Four." As opposed to Shauntal, who literally says "I'm the Elite Four's Ghost-type Pokémon user."
