Latios

Latios is widely regarded as one of the best Dragon-types in BW OU, sporting an amazing Special Attack and a blistering base 110 Speed stat, allowing it to outspeed every other unboosted Dragon-type. In the DW metagame, it retains its lethal status, but due to the presence of common threats such as Choice Scarf Genesect and Choice Scarf Shadow Tag Chandelure, Latios finds itself hard-pressed to compete with its Dragon-type brethren, most notably Garchomp and Dragonite. However, Latios does have some perks over its brethren. Although its secondary Psychic typing might seem like a thorn in Latios's side due to its susceptibility to Pursuit as well as its weaknesses to Bug- and Ghost-type moves, it lets Latios easily revenge kill one of the most common and dangerous threats in the DW metagame: Keldeo. In addition, Latios has the highest Special Attack of any Dragon-type in the metagame, which allows it to pose a significant threat to common walls, such as Forretress and Skarmory. Psyshock allows it to break through not only Keldeo, but also Blissey and Chansey, something that other special attackers have difficulty doing. Despite Latios's more obvious flaws in the DW metagame, it is still a potent threat that many teams can be unprepared for.