The Battle Frontier (75 / 106) card can be found in the Emerald set.
Recently sold 1 times and based on those sales is worth around £13.22.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £13.22 to £13.22, making it very stable.
This Uncommon card was illustrated by Midori Harada.