Slaking

Slaking has amazing stats, with the greatest base Attack and HP in the metagame, as well as a wide movepool to handle specific threats, such as Thunderbolt for Pelipper and Fire Blast for Gourgeist-XL and Tangela. However, the ability Truant completely holds Slaking back from being effective in competitive play, almost negates its amazing stats, and can make it lose to Protect and Substitute. Truant also makes Slaking setup fodder for, most importantly, Speed-boosting Pokemon such as Huntail, Fraxure, and Regice; Slaking will then be outsped and unable to Encore the foe into a boosting move. Due to its horrendous ability, there is absolutely no reason to use Slaking over Bouffalant, Ursaring, or Stoutland.