The Charizard VMAX (SWSH261) card can be found in the Swsh Black Star Promos set.
Recently sold 12 times and based on those sales is worth around £13.00.
Currently, there are 46 open listings for this card on ebay.
This card sells in the range of £11.30 to £14.70, making it very stable.
This is a Promo card.
The fact that it is a VMAX card makes it one of the more valuable cards.