The Dark Tyranitar (20 / 109) card can be found in the Team Rocket Returns set.
Recently sold 2 times and based on those sales is worth around £62.50.
Currently, there are 2 open listings for this card on ebay.
This card sells in the range of £30.23 to £94.77, making it highly volatile.
This Rare card was illustrated by Kyoko Koizumi.