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Pokémon Card VS - ポケモンカード★VS is a Japanese-language expansion; it has no corresponding English-language expansion.

The expansion includes 151 cards.

The VS expansion was distributed in a non-conventional manner. While the cards were still packaged in foil packs, each of these packs contained 30 cards instead of the traditional 10 cards. This was also the first time the term 'half deck' was officially used and became a recognized method of gameplay. There were three random half decks released: Grass & Lightning - 草 雷ハーフデッキ, Water & Fire - 水炎ハーフデッキ, and Fighting & Psychic - 闘超ハーフデッキ. Each half deck contained a random assortment of set type Pokémon (i.e. one could only get a Fire-type Pokémon in the Water & Fire half deck). Colorless-type Pokémon and Trainer cards could be found in all half decks.

The 30 cards in each booster pack consisted of: 11 energy cards, 11 character cards, 6 trainer cards (2 of which were TMs), 1 holo character card, and 1 holo special energy card.

Wizards of the Coast officially stated that they had no plans to release the VS set, primarily because they had competitive play in mind. Some cards from this expansion were still released in English in the Tyranitar Half Deck; however, these cards were produced by MEDIAFACTORY and received a limited release to competitors of the 2001 Tropical Mega Battle. Despite this statement, Pokémon USA localized the Generation IV equivalent, Pokémon SP when they debuted in the Platinum expansion.

-- summary obtained from: https://leonhartopedia.fandom.com/wiki/Pok%C3%A9mon_VS_(TCG)