The Mr. Mime ex (111 / 112) card can be found in the Firered and Leafgreen set.
Recently sold 2 times and based on those sales is worth around £18.08.
Currently, there are 4 open listings for this card on ebay.
This card sells in the range of £16.00 to £20.16, making it very stable.
This Rare Holo Ex card was illustrated by Ryo Ueda.
The fact that it is a EX card makes it one of the more valuable cards.