Misty's Tentacruel #10 from Gym Heroes is a 1st edition holo holo_rare card that currently sells for about $66.00 ungraded, with graded copies ranging from $35.00 at grade 7 to $74.99 at grade 10. A grade 10 copy sells for around $74.99 vs $66.00 raw. That's a modest premium, so grading only pays off for near-perfect copies.