Collectively, the Half Decks focus on the Generation I starters and their evolutions. Unlike previous Half Decks, which have their own numbering system, these decks all have a collective numbering system. Each deck contains a fixed selection of cards and a random selection of those numbered 005 to 008, 013 to 016, and 021 to 052. Any of these cards, if included, will always be paired by evolutionary family. Other cards that are part of the collection but share the same type as the featured Pokémon are never included in that particular deck, but are available in the other two.
Like many others, these Half Decks each include a rulebook, damage counters, status counters, and a custom coin.
- The trend of releasing TCG products with random cards is not an uncommon theme in Japan, though is usually reserved for the first expansion in a new Generation or transitional era. Generation III was the only Generation not to feature a Starter Deck in its first expansion, instead these Half Decks being the ones to feature the innovation.
- The majority of these cards were combined with the main expansion to form the English set.
- The symbol used on cards in the Half Decks was used on cards in the English expansion.