Xerneas

The most powerful and versatile Fairy-type available, Xerneas is capable of pulling off a variety of tricks and is able to do them well. The Geomancy set shapes the metagame around it, being one of the most dangerous albeit prepared-for sets in the tier. Although Xerneas's raw stats aren't particularly impressive in a single aspect, its defensive stats are solid and backed up by an above average HP stat, and its base 99 Speed allows Xerneas to outspeed several relevant threats in the Ubers tier. While base 131 Special Attack is good, it's not particularly high without a Special Attack boost or a Life Orb, as many other threats in the Ubers tier such as Mewtwo and Kyogre have higher raw offenses and Xerneas's coverage moves aren't boosted by Fairy Aura. Xerneas's ability functions as a buffed Life Orb for Moonblast without forfeiting the item slot or taking recoil, making offensive sets more potent and allowing defensive sets to hit hard without investment. Mono-Fairy typing is good defensively, granting only a few weaknesses along with a handy immunity to the Dragon type. Xerneas is capable of running many coverage moves, although most of these are either weak or have an accuracy drawback. It does have some good support moves such as Aromatherapy and Roar, but the lack of instant recovery means it has to run Rest on a defensive set. Furthermore, Xerneas is afflicted by all entry hazards and by all nonvolatile status, somewhat reducing its defensive synergy. Some Xerneas sets are vulnerable to Shadow Tag Mega Gengar, and Xerneas is impacted by the fact that the most common Pokemon in the tier, Primal Groudon, resists Moonblast.