Gyarados #6 from Base Set is a holo rare card that currently sells for about $19.99 ungraded, with graded copies ranging from $73.50 at grade 7 to $3,000 at grade 10. TCGrader's AI has graded 17 copies of Gyarados (Base Set), averaging 6.1 overall. A grade 10 copy sells for around $3,000, about 150× the $19.99 raw price, so high-grade copies are worth grading.