Misty's Gyarados #13 from Gym Challenge is a unlimited holo holo_rare card that currently sells for about $24.99 ungraded, with graded copies ranging from $35.00 at grade 7 to $600 at grade 10. A grade 10 copy sells for around $600, about 24× the $24.99 raw price, so high-grade copies are worth grading.