Heatran

Heatran possesses a unique Fire / Steel typing and the ability Flash Fire, which grant it nine resistances and an immunity to Fire-type moves, allowing it to switch in on a lot of common threats in the Doubles metagame and serve as a great check for sun offense and Fairy-types. With a high Special Attack stat and good bulk, it serves as a strong offensive support Pokemon, capable of delivering significant damage to the opposing team. However, Heatran is held back by its weaknesses to common offensive types such as Fighting, Ground, and Water. A fairly linear movepool makes Heatran quite predictable, and its middling Speed tier leaves it outrun by common threats when using its faster sets and undersped in Trick Room by common Trick Room sweepers.