Torkoal has naturally high Defense, very passable Offensive Stats, and can use Amnesia just once for a Special Defense stat as good as its Defense. One turn of setup for a very good Multipurpose Wall.
It can pack Will-O-Wisp OR Toxic for crippling, and packs power Fire-type STABs, as well as potent other attacks, like Body Slam, Gyro Ball, and Earthquake.
Heat Wave (STAB)
Amnesia (Just one, and you've got very frightening bulk)
Gyro Ball (Backup attack)
Protect (use to negate an attack)
Sleep Talk / Amnesia
Heat Wave / Return / Gyro Ball / Earthquake