From Bulbapedia, the community-driven Pokémon encyclopedia.
Evolution (Japanese: 進化のふしぎ Mystery of Evolution) is one of the five sets found in Pokémon Trading Card Game for the Game Boy Color.
The booster pack image features a Charizard.
Club Masters and their Club Members usually give out these booster packs when they are defeated. Some of Dr. Mason's mail also have these booster packs as an attachment.
Evolution includes cards from Base Set, the Jungle expansion, and Fossil expansion. Marowak and Jigglypuff are included as in-game exclusive cards.