The Dark Tyranitar (20 / 109) card can be found in the Team Rocket Returns set.
Recently sold 3 times and based on those sales is worth around £48.42.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £37.88 to £58.96, making it quite volatile.
This Rare card was illustrated by Kyoko Koizumi.