Blaziken

Blaziken was one of the Pokemon that was released from Ubers to reign free in the Dream World OU tier. With its Dream World ability, Speed Boost, Blaziken can remedy its low Speed and become an immensely powerful sweeper. While Blaziken can still sweep outside of sun, its effectiveness is somewhat reduced. Rain, however, is very detrimental to Blaziken's success as a sweeper, as it cuts the power of Blaziken's Flare Blitz. Additionally, low defenses leave Blaziken susceptible to priority, though it should be noted that no priority user in the tier can safely switch in. Despite all these difficulties, amazing offensive typing and high offensive stats keep Blaziken a top-tier Pokemon. All these advantages and disadvantages combine to make a downright amazing Pokemon that can sweep nearly any team under the right conditions.