Well..... I WOULD say Murkrow but, I know it isn't it the OU tier. Murkrow falls in either NE or that other one..... forget now. Nevermind. All I know is that Murkrow isn't competitive battle material no matter how much I love it.
So instead I nominate Dragonite. It's in the OU tier. I prefer Dragon Dance Dragonite. That one is the one with this specific movepool: Dragon Dance, Dragon Claw, Roost, Earthquake. Life Orb or Leftovers are the held items for it; I prefer Leftovers 'cause I think Life Orb is too chancey. Most of the EVs go towards HP and Speed with 44 towards Attack. Adamant nature is best for a Dragon Dance Dragonite; for the Attack stats you see. This kind of Dragonite sets up attack and speed boost with Dragon Dance and then can sweep the opposing team using Dragon Claw and Earthquake. Total powerhouse. Love it.