TCGrader's AI has graded 3 copies of Arceus & Dialga & Palkia-GX (Cosmic Eclipse), 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 $111, about 4.6× the $24.10 raw price, so high-grade copies are worth grading.