The Metagross ex (95 / 101) card can be found in the Hidden Legends set.
Recently sold 4 times and based on those sales is worth around £30.61.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £17.72 to £43.50, making it quite volatile.
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.