The Erika's Venusaur (4 / 132) card can be found in the Gym Challenge Unlimited set.
Recently sold 8 times and based on those sales is worth around £66.00.
Currently, there are 10 open listings for this card on ebay.
This card sells in the range of £46.41 to £85.59, making it quite volatile.
This Rare Holo card was illustrated by Ken Sugimori.