Pokémon Mystery box - Big Three Box - Various sets

The 'Big Three Box' Pokémon Mystery Box typically refers to a collection focusing on three of the franchise's starter Pokémon or key characters, often including Charizard, Blastoise, and Venusaur — the original trio from the Base Set. Such a mystery box usually contains an assortment of cards featuring these fan-favorite Pokémon across various expansions. Collectors enjoy these because they concentrate on highly sought-after cards from popular characters, potentially including rare holo cards, promotional prints, or graded cards. Mystery boxes like this allow collectors to both build and diversify their collections centered around iconic Pokémon without knowing the exact contents beforehand, adding an element of surprise and excitement.