Mewtwo-GX is card #SV59 of 94 in Hidden Fates Shiny Vault (2019), a Rare Shiny GX illustrated by 5ban Graphics. At about $139 it is the #5 most valuable card in the set. In a Hidden Fates Shiny Vault booster it turns up about once every 341 packs. It is one of 89 Mewtwo cards printed so far.
1999Base Set
2003Ruby & Sapphire
2006Holon Phantoms
2009Pokémon Rumble
2015BREAKthrough
2019Unified Minds
2023Crown Zenith
202630th Celebration

















See the full Hidden Fates Shiny Vault card list
An ungraded Mewtwo-GX from Hidden Fates Shiny Vault sells for about $139. A PSA 10 is worth more, roughly $695 by our estimate, and a PSA 9 around $320.
It is a Rare Shiny GX, and it shows up about once every 341 Hidden Fates Shiny Vault packs.
5ban Graphics drew the art for this card.