The Cynthia & Caitlin (228 / 236) card can be found in the Cosmic Eclipse set.
Recently sold 6 times and based on those sales is worth around £53.50.
Currently, there are 9 open listings for this card on ebay.
This card sells in the range of £38.69 to £68.31, making it quite volatile.
This Rare Ultra card was illustrated by Sakiko Maeda.