Decepticon Doubledealer doesn't really care whom he works for, as long as they  can pay his fee. And pay they do. The amount of firepower he carries more than  makes up for the fact that he's totally untrustworthy. He carries enough  explosive power with him to shatter mountains to dust, and for that both the  Autobots and the Decepticons are willing to pay dearly, handing over crates full  of Energon chips in exchange for a single battle's worth of services.