Melmetal-GX is card #SM178 of 248 in SM Black Star Promos (2017), a Promo illustrated by PLANETA Otani. At about $3.83 it is the #185 most valuable card in the set. It is one of 16 Melmetal cards printed so far.
2017SM Black Star Promos
2019Unbroken Bonds
2020Darkness Ablaze
2021Fusion Strike
2022Pokémon GO
2023Obsidian Flames
2024Temporal Forces

















See the full SM Black Star Promos card list
An ungraded Melmetal-GX from SM Black Star Promos sells for about $3.83. A PSA 10 is worth more, roughly $19.15 by our estimate, and a PSA 9 around $8.81.
It is a Promo.
PLANETA Otani drew the art for this card.