Koga's Ditto #10 from Gym Challenge is a 1st edition holo holo_rare card that currently sells for about $68.39 ungraded, with graded copies ranging from $87.38 at grade 7 to $69.99 at grade 10. A grade 10 copy sells for around $69.99 vs $68.39 raw. That's a modest premium, so grading only pays off for near-perfect copies.