From Bulbapedia, the community-driven Pokémon encyclopedia.
Golden Books is the subdivision of the American book publishing corporation Western Publishing, which focuses on publishing children's books. The corporation went bankrupt in August of 2001 and was bought by Classic Media (Family Entertainment) and Random House (publishing).
For the Pokémon franchise, Golden Books published the Pokémon Adventure Series, as well as various activity books. The company was most famous for publishing Little Golden Books, as well as children's books based on Disney movies.
List of Pokémon books published by Golden Books