The Groudon EX (85 / 160) card can be found in the Primal Clash set.
Recently sold 17 times and based on those sales is worth around £4.13.
Currently, there are 15 open listings for this card on ebay.
This card sells in the range of £2.34 to £5.92, making it very stable.
This Rare Holo Ex card was illustrated by Ryota Murayama.
The fact that it is a EX card makes it one of the more valuable cards.