The Lugia ex (105 / 115) card can be found in the Unseen Forces set.
Recently sold 11 times and based on those sales is worth around £74.72.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £0.01 to £188.28, making it highly 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.