The Lugia (SWSH069) card can be found in the Swsh Black Star Promos set.
Recently sold 2 times and based on those sales is worth around £31.89.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £23.79 to £39.99, making it quite stable.
This Promo card was illustrated by kodama.