Klefki from XY11 has been revealed! Thanks goes to Vincent for the translation!
Ability: Wonder Lock
Once during your turn (before your attack), if this Pokemon is on your Bench, you may discard all cards attached to this Pokemon and attach this Pokemon to 1 of your Pokemon as a Pokemon Tool card. As long as this Pokemon is attached to a Pokemon, prevent all damage done to that Pokemon by the attacks of your opponent’s Mega Evolution Pokemon. At the end of your opponent’s next turn, discard this card.
[Y][C] Fairy Wind: 30 damage.
Weakness: Metal (x2)
Resistance: Darkness (-20)