The Mega Lopunny & Jigglypuff GX (226 / 236) card can be found in the Cosmic Eclipse set.
Recently sold 8 times and based on those sales is worth around £24.50.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £9.69 to £39.31, making it quite volatile.
This Rare Ultra card was illustrated by Shibuzoh..
The fact that it is a GX card makes it one of the more valuable cards.