Mega Gardevoir ex #178 from Mega Evolution is a illustration_rare card that currently sells for about $157 ungraded, with graded copies ranging from $140 at grade 7 to $305 at grade 10. TCGrader's AI has graded 24 copies of Mega Gardevoir ex (Mega Evolution), averaging 8.6 overall. 33% scored 9 or higher, so a strong copy is achievable but far from guaranteed. A grade 10 copy sells for around $305 vs $157 raw. That's a modest premium, so grading only pays off for near-perfect copies.