Xerneas

With Fairy Aura and Geomancy boosting its already strong Moonblast, Xerneas can become one of the most dangerous offensive sweepers in the metagame. Its coverage and utility options to prevent certain checks from beating it are all very great, giving it both versatility and effectiveness in all of its moveslots. Xerneas has fairly high natural bulk with a good typing, letting it also potentially wall many dangerous wallbreakers such as Zekrom, Zygarde, and Marshadow. Most of Xerneas's offensive power comes from Geomancy, though, meaning that if it is phazed or otherwise forced out, its effectiveness offensively is severely hurt, and defensive sets without it struggle to break through most walls in general.