Mewtwo

The classic God of Pokemon has always been one of the most fearsome combatants of Ubers, but BW has given Mewtwo a gift so great that even Arceus is jealous: Psystrike. This move strikes fear into old nemeses Blissey, Ho-Oh, and Kyogre, as it makes Mewtwo a fearsome mixed attacker with almost none of the previous downsides! Like many other Uber Pokemon, Mewtwo has the stats and movepool to do virtually anything it wants. With viable sets that range from a fearsome sweeper to a frustrating staller, its versatility ensures that there is absolutely nothing that can counter it. However, while it is by no means frail, Mewtwo is not the bulkiest Pokemon around, and with its susceptibility to entry hazards and priority attacks, its longevity is an issue in the hard hitting Uber metagame. Like other Pokemon with huge movepools, it is a pity that Mewtwo can only use four of them at the same time. These problems highlight its greatest flaw of all: Mewtwo is unable to run everything at once. You have to choose between bulk and power, and Mewtwo's typing is rather poor defensively. BW2 also introduced Genesect, which made Mewtwo a lot easier to check for offensive teams. It is otherwise perfect, as its flaws end here. Dr. Fuji's dream was to create the world's most powerful Pokemon, and he most definitely succeeded.