Crustle

While Crustle might seem like an inferior Golem or Donphan, it has one trick up its sleeve: Shell Smash. This is one of the best moves and the game, and boosts Crustle's lackluster Speed while boosting its Attack to threatening levels. With Sturdy, Crustle doesn't usually struggle to set up. However, even after a Shell Smash, Crustle still has a mediocre Speed stat. Additionally, Pokemon that resist Rock often have no problems beating Crustle, Steel-types like Magearna and Mega Metagross and Ground-types like Zygarde-C don't take much damage from Crustle's Rock-type moves, even after a Shell Smash.