Rayquaza

When people think of a threatening Pokemon that can devastate teams in a matter of seconds, Rayquaza immediately comes to mind. With base offenses of 150 each, Rayquaza is by far one of Uber's most threatening wallbreakers and sweepers. Its great offensive typing coupled with boosting moves such as Dragon Dance and Swords Dance make Rayquaza an even bigger threat in seconds. If you thought having two of the most useful boosting moves as well as some of the best attacking stats in the game was threatening enough, it also gets an expansive movepool which includes the best priority move in the game, Extreme Speed. Rayquaza also has another tool it can use to great effect: its ability, Air Lock. Thanks to Air Lock, it negates weather and weather-related abilities, which means it can check Pokemon that rely on weather to sweep, such as Kingdra and Venusaur. Rayquaza is also a very versatile Pokemon, as its stats imply. It has the ability to run either physical or mixed sets, and it can run a boosting set or immediately go on the offensive with its powerful attacks. It can even use Choice items to become an even bigger threat.

While one might look at Rayquaza and think "this must be one of the hardest Pokemon to take down," it does have a few flaws. For one, thanks to its Flying typing, it has a weakness to Stealth Rock, the most common form of entry hazard, which limits its ability to switch in. Its defenses, which are low by Uber standards, don't help this cause either. Nevertheless, Rayquaza still remains one of the most threatening sweepers in the Uber tier, and it can demolish teams in a heartbeat if given the chance.