The Gardevoir ex (245 / 198) card can be found in the Scarlet and Violet set.
Recently sold 13 times and based on those sales is worth around £30.00.
Currently, there are 23 open listings for this card on ebay.
This card sells in the range of £25.19 to £34.81, 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.