Although never made publicly available, this card was shown off on the P25 Music website. A physical card was printed, but was only given to Post Malone himself.[1]
Origin
This card depicts Post Malone, an American singer, songwriter and television personality who contributed the song "Only Wanna Be With You" to Pokémon 25: The Album, as well as hosting a virtual concert as part of the P25 Music events. The card's set number reflects Post Malone's birthday (July 4th), per the American date and time notation style.