Heatran

With great base stats all around, including 90 / 106 / 106 bulk and an incredible base 130 Special Attack stat, as well as an excellent movepool, Heatran has all the tools it needs to be a solid pokemon in the Almost Any Ability metagame. Because of this, Heatran can viably use several abilities, making it extremely unpredictable between its offensive and defensive movesets. Its typing blesses it with resistances to common priority moves, including Gale Wings Brave Bird and Refrigerate or Pixilate Extreme Speed. However, its typing also gives it weaknesses to three of the most common attacking types: Fighting, Ground, and Water. Lack of a reliable source of recovery means that more defensive Heatran sets get worn down easily, while Flash Fire's omnipresence in the metagame severely hinders offensive Heatran's effectiveness. Heatran also often finds itself trapped by the ever-so-common Magnet Pull, making it extremely easy to get rid of.