Raikou

If you think Raikou is now considered less of a threat due to dropping from BL to UU this generation, you couldn't be more wrong. Its wide offensive movepool with coverage options such as Aura Sphere, Extrasensory, and Hidden Power, as well as access to Calm Mind all contribute to give Raikou a huge recognition in the tier as a powerful and versatile sweeper, having the ability to sweep through entire teams if you are not properly prepared to face it. Moreover, as a consequence of being considered as a legendary Pokemon, its defensive stats of 90 / 75 / 100 are not bad either, and that will result in a much easier time sweeping or taking a somewhat weak neutral attack.

It's not all roses and candies for Raikou though. Special walls such as Snorlax can ruin its sweep, and fast Ground-types such as Choice Scarf Flygon and Choice Scarf Krookodile can absorb an Electric-type move and OHKO with Earthquake. Using the event moves, namely Aura Sphere, forces Raikou to run a Rash nature, therefore reducing its speed to 329, outpacing only up to base 100 Speed Pokemon by the minimum margin. Even though Raikou has its flaws, it should never be underestimated, as with the proper support, it can shred teams apart easily.