Victini

Victini's main claim to fame is its access to V-create, one of the most powerful moves in Pokemon. Thanks to this, alongside its wide movepool, it can act as a solid wallbreaker, with barely any truly reliable counters to its name. Moreover, it has a decent typing with good resistances to common types such as Fairy, Fire, Steel, Psychic, and Fighting alongside good natural bulk, which enables it to check big threats such as Scizor, Mega Metagross, Mega Gardevoir, Breloom, and Clefable lacking Thunder Wave. Unfortunately, it suffers from a large number of flaws, such as V-create's Speed drop, which makes Victini very exploitable after using it. And while its Speed is good, it doesn't match up to many OU threats such as Latios, Keldeo, and Starmie, which can revenge kill it easily. Its typing also leaves it weak to common offensive types like Water, Ground, and Dark, which in turn makes it vulnerable to many common Pokemon such as Landorus-T, Azumarill, and Garchomp. Furthermore, its role as a wallbreaker is severely hindered by its weakness to Stealth Rock, as well as the popularity of Choice Scarf Tyranitar, which can Pursuit trap it.