Brock's Rhyhorn #22 from Gym Heroes is a 1st edition holo rare card that currently sells for about $15.53 ungraded, with graded copies ranging from $22.84 at grade 7 to $67.00 at grade 10. A grade 10 copy sells for around $67.00, about 4.3× the $15.53 raw price, so high-grade copies are worth grading.