As noted up higher, Volcarona is good. I play Pokebank, so I'm resisting the urge to say Latios (you might want to consider that in less than 1 month, though). Other options are Gengar, Calm Mind Alakazam, Nasty Plot Togekiss, Mega Ampharos, Special Aegislash, Reuniclus, and Arcanine (that would...