: This refers to the first season of the Pokémon anime series, which originally aired from 1997 to 1999. The Indigo League follows the adventures of a young Pokémon trainer named Ash Ketchum and his friends as they travel through the Kanto region.
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The Indigo League (Season 1) debuted in 1997, introducing Ash Ketchum and his partner Pikachu to the world.