RE: Counter That Deck!
M Manectric EX / Fighting Basics
Manectric eats up Yveltal, while the Fighting basics are very good against their Manectric and Darkrai. It plays 3 Fighting Stadium, so Shadow Circle will rarely be in play. (With all that stuff in their deck, they won't have room for 3 Shadow Circle.) It also has Max Potion, which is generally helpful against that deck.