The Professor's Research (84 / 78) card can be found in the Pokémon Go set.
Recently sold 24 times and based on those sales is worth around £27.72.
Currently, there are 6 open listings for this card on ebay.
This card sells in the range of £23.04 to £32.40, making it stable.
This Rare Rainbow card was illustrated by Yusuke Kozaki.