The Raichu ex (97 / 106) card can be found in the Emerald set.
Recently sold 6 times and based on those sales is worth around £17.34.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £0.01 to £36.30, 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.