There are no cards rarer than the Pikachu Illustrator promo card though, which saw a PSA Grade 10 quality version become the most expensive in existence thanks to Logan Paul splashing over $5 ...
The card features artwork by Atsuko Nishida, the creator of Pokémon's mascot, Pikachu. There are only 10 confirmed copies of the Pikachu Illustrator card remaining, making it the rarest card overall.