Expanded: Night March
Standard: Greninja
For Fun: Pinsir (SM)/Hammers/Team Rocket's Handiwork
Other decks I've played: Tyranitar EX, M Gardevoir (STS), Rainbow Road, Darkrai-EX/Giratina/Garbordor, Pyukumuku/Decidueye-GX, Volcanion, Gyarados, Yveltal/Tauros-GX.