Misty's Gyarados #13 from Gym Challenge is a 1st edition holo holo_rare card that currently sells for about $127 ungraded, with graded copies ranging from $197 at grade 7 to $2,700 at grade 10. A grade 10 copy sells for around $2,700, about 21× the $127 raw price, so high-grade copies are worth grading.