The Brock's Grit (107 / 108) card can be found in the Evolutions set.
Recently sold 6 times and based on those sales is worth around £4.20.
Currently, there are 7 open listings for this card on ebay.
This card sells in the range of £2.44 to £5.96, making it very stable.
This Rare Ultra card was illustrated by Hitoshi Ariga.