The Wailord EX (38 / 160) card can be found in the Primal Clash set.
Recently sold 6 times and based on those sales is worth around £2.95.
Currently, there are 6 open listings for this card on ebay.
This card sells in the range of £0.92 to £4.98, making it very stable.
This Rare Holo Ex card was illustrated by Eske Yoshinob.
The fact that it is a EX card makes it one of the more valuable cards.