He was struggling with a very large conger, and holding fast with one hand to the side of the vessel, in order to seize with the other the gaping jowl of his antagonist, when the master said to him, Take care they don't see you from Belle-Isle.
In Naruto each base-element is stronger and weaker than one element:-. Fire: strong against Wind, weak against Water. Wind: strong against Lightning, weak against Fire. Lightning: strong against Earth, weak against Wind. Earth: strong against Water, weak against Lightning.
Earth Power is Claydol's main STAB move, and it does good damage to various entry hazard setters such as Crustle, Garbodor, Regirock, and Mawile. Shadow Ball allows Claydol to hit Ghost-types such as Mismagius, Rotom, and Gourgeist, which not only block its Rapid Spin but would also take its Earth Power with ease.