The Groudon ex (93 / 101) card can be found in the Hidden Legends set.
Recently sold 5 times and based on those sales is worth around £35.67.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £15.82 to £55.52, making it quite volatile.
This Rare Holo Ex card was illustrated by Hikaru Koike.
The fact that it is a EX card makes it one of the more valuable cards.