Pikachu V-UNION is card #SWSH139 of 307 in SWSH Black Star Promos (2019), a Promo. At about $6.24 it is the #96 most valuable card in the set. It is one of 213 Pikachu cards printed so far.
1999Base Set
2004FireRed & LeafGreen
2007Power Keepers
2011Black & White
2015Roaring Skies
2019Cosmic Eclipse
2022Brilliant Stars
202630th Celebration

















See the full SWSH Black Star Promos card list
An ungraded Pikachu V-UNION from SWSH Black Star Promos sells for about $6.24. A PSA 10 is worth more, roughly $31.20 by our estimate, and a PSA 9 around $14.35.
It is a Promo.