So here the thing, I was just playing a match online. When I thought I had my opponent dead to rights. His active pokemon was a Sylveon Gx with 90 dmg on it and his benched pokemon was a Gardevoir GX with 50 dmg on it. Any way I use espeon's Miraculous Shine :Devolve each of your opponent's evolved Pokémon and put the highest Stage Evolution card on it into your opponent's hand.
It worked for Gardevoir GX but not Sylveon Gx. So there you have it, hope it gets fixed soon.