The Ho-Oh ex (104 / 115) card can be found in the Unseen Forces set.
Recently sold 4 times and based on those sales is worth around £50.14.
Currently, there are 10 open listings for this card on ebay.
This card sells in the range of £45.45 to £54.83, making it stable.
This Rare Holo Ex card was illustrated by Mitsuhiro Arita.
The fact that it is a EX card makes it one of the more valuable cards.