According to multiple sources, the most valuable Pokemon card is the Pikachu Illustrator card, which is extremely rare and was only given to winners of a 1997 art competition held by CoroCoro. As of July 2021, the card sold for a record-breaking $5.275 million, making it the most expensive Pokemon card ever sold. Other valuable Pokemon cards include:

• Gold Star Pokemon Cards: These are some of the most valuable Pokemon cards ever produced, with Espeon and Umbreon being two of the rarest cards in the set. PSA values the two cards at $194,209 and $187,277 respectively.
• Blastoise #009/165R Commissioned Presentation Galaxy Star Hologram: One of only two such Pokemon cards in existence, this Blastoise sold at auction in January 2021 for $360,000, making it one of the most valuable Pokemon cards of all time.
• Shadowless Charizard: This 1999 base card can go for an absurd amount, especially if its "Shadowless" - an early print version that doesnt have a shadow around the arts border. In January 2021, a sale of this card in Gem Mint 10 condition fetched $300,000.
• Trophy Pikachu Gold: Given out in 1998 to the top 3 players of the Japanese Pokemon Lizardon tournament, only seven of these cards have ever appeared for grading. One was most recently sold for $128,900.

Its worth noting that the value of Pokemon cards can fluctuate over time, and the condition of the card can greatly affect its value. Mint, rare, and out-of-print cards tend to hold their value best.