Yveltal

Yveltal is a versatile Pokemon thanks to its solid 126 / 95 / 98 bulk, mixed 131 / 131 offenses, and a useful Dark / Flying typing that let it perform various defensive roles on teams while not being passive. This typing grants it an immunity to Psychic, a resistance to Ghost, and a neutrality to Fighting, allowing it to serve as a check to offensive threats such as Mega Mewtwo Y and Mega Gengar. Fur Coat Yveltal can also serve as a check to certain Mega Mewtwo X sets, like Dazzling and Contrary, but it must be healthy in order to do so, while Unaware sets are good against setup sweepers due to Yveltal's immunity to Photon Geyser and Stored Power and resistance to Moongeist Beam and Power Trip. Its Flying typing also makes Yveltal immune to Spikes, which typically hinder other Dark-types. Its Dark typing is also useful for forcing out spinblockers like Giratina and Aegislash and for an immunity to Prankster status moves. The downside of Yveltal’s typing is its weaknesses to the common –ate ability wallbreakers like Mega Diancie, Kyurem-B, and Kyurem-W as well as its weakness to Stealth Rock. Weaknesses to Fairy, Ice, and Electric also hurt Yveltal’s ability to check offensive threats with powerful coverage moves like Fleur Cannon, Moonblast, Ice Hammer, Ice Beam, and Bolt Strike. Yveltal needs to stay healthy throughout the battle in order to check the threats it needs to, and its Stealth Rock weaknesses makes it harder to stay healthy enough to do its job. While Yveltal's typing and common sets handle some dangerous offensive threats, there are still many potent offensive threats that beat it like Primal Groudon, Mega Diancie, Xerneas, Regigigas, and Sheer Force Mewtwo Mega Y with Bolt Strike.