Palkia

Palkia is an absolute menace in the Uber environment. Its dual STABs have great coverage with its excellent Special Attack, Attack, and Speed stats backing them up. To further elaborate, Palkia's Speed stat is unique in Ubers as max Speed Palkia outpaces many threats in the metagame, such as Groudon, Kyogre, Ho-Oh, Dialga, Giratina-O, Rayquaza, and the standard Lugia. Palkia is a type of Pokemon who works in both rain and sunshine, and that alone makes handling Palkia difficult. Defensively, Palkia is one of the very few Pokemon who can take a Choice Specs Water Spout from Kyogre, which is proclaimed as the most powerful special attack in Ubers. The typing gives Palkia resistances to Water-, Fire-, and Steel-type moves, while leaving Dragon-type moves as its lone weakness. Overall, Palkia is a powerful Pokemon in the Uber environment, and it's difficult to say that it even has counters, as it easily 2HKOes most Pokemon who attempt to switch into it.