Gengar

Gengar is a solid team option in VGC 2014 because of its ability to wall opposing Mega Kangaskhan as well as support one's own. Furthermore, Gengar's Mega Evolution's ability, Shadow Tag, prevents opposing Pokemon from switching. Gengar also has a great offensive typing with its Ghost and Poison-type STAB moves hitting almost everything common in the metagame outside Tyranitar for neutral damage. However, Gengar still has the defenses of a toothpick and will easily faint to any super effective hit, which is why most people opt against using it unless paired with Mega Kangaskhan.