Groudon

At first glance, Groudon may not seem to have what it takes to be a defining force in Ubers. However, it's one of the best wallbreakers and sweepers in the whole tier. With its signature move, Precipice Blades, and excellent Attack, offensive Groudon sets can even stop Zygarde from transforming into Zygarde-C through pure force. Defensively, Groudon's typing and excellent physical bulk let it check physical threats such as Zekrom. Good bulk, an immunity to Thunder Wave, and several boosting options in Rock Polish, Bulk Up, and Swords Dance allow Groudon to decimate many common defensive cores, and these traits give it an easy time setting up on common Pokemon such as Necrozma-DM. Groudon does have trouble getting past the few checks it does have, although even these can be dealt with with the right coverage move. Groudon's main flaws are that its attacks often have low accuracy and it has no reliable recovery, meaning it can be worn down over time by status, Knock Off, and repeated attacks; additionally, if it lacks Rock Polish, Groudon is slow and prone to being picked off by faster threats such as Calyrex-S.