The Vaporeon (18 / 113) card can be found in the Delta Species set.
Recently sold 7 times and based on those sales is worth around £37.29.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £0.01 to £76.67, making it highly volatile.
This Rare Holo card was illustrated by Kouki Saitou.