The Koraidon ex (247 / 198) card can be found in the Scarlet and Violet set.
Recently sold 14 times and based on those sales is worth around £25.00.
Currently, there are 12 open listings for this card on ebay.
This card sells in the range of £21.54 to £28.46, making it stable.
This Special Illustration Rare card was illustrated by Ryota Murayama.
The fact that it is a EX card makes it one of the more valuable cards.