The Gardevoir ex (245 / 198) card can be found in the Scarlet and Violet set.
Recently sold 30 times and based on those sales is worth around £22.49.
Currently, there are 13 open listings for this card on ebay.
This card sells in the range of £17.92 to £27.06, making it stable.
This Special Illustration Rare card was illustrated by Jiro Sasumo.
The fact that it is a EX card makes it one of the more valuable cards.