According to the search results, the rarest Pokemon card in the world is the Pikachu Illustrator card. This card is widely considered the rarest and most expensive Pokemon card in existence. Originally given as a prize in a 1997 art competition by CoroCoro, the card has consistently fetched high prices over the past five years, typically between $375,000 and $6 million. Only 39 copies were passed out in 1998, and just ten confirmed copies exist today. Another extremely rare card is the No Rarity Pikachu card, which was given out to winners of the 1998 Japanese Super Secret Battle tournament. Only four copies of this card are known to exist.