A MEGA, EX Pokemon Card of type Fairy with the title M Diancie-EX and 190 HP of rarity Promo evolved from Diancie-EX from the set XY Black Star Promos.  It has the attack Diamond Force with the cost Fairy, Fairy, Colorless, the energy cost 3 and the damage of 100 with the description: During your opponent's next turn, prevent all damage done to each of your Pokemon from your opponent's Pokemon-EX. (If this Pokemon is no longer your Active Pokemon, this effect ends.) It has weakness against Metal 2. It has resistance against Darkness -20. 
M Diancie-EX