Shellder Is a cheeky bivalve (oyster or clam) Pokémon; it constantly pokes its tongue out at anybody, whether friend or foe. It will also spit on foes. This tends to antagonize enemies into a rage. Its shell is very strong, apparently harder than a diamond, though only made of a single, smooth layer. Shellder becomes vulnerable when the enemy can attack its insides. When not protecting itself in battle, it will attack by squirting water at the foe. As a last resort, it will clamp the foe with its powerful shell. However, this leaves Shellder vulnerable to an attack, hence, it is rarely used. As a total last resort, Shellder may use Selfdestruct or Explosion to knock itself and the enemy out. Shellder travels by rapidly opening and closing its shell, propelling it in the opposite direction of its shell through the water. Shellder are incapable of travel on land, unless in a Poké Ball. It's tongue is soft and pink, and must be sticky enough to catch prey on the seafloor. Shellder is integral to the evolution of Slowpoke as is the body part of Slowpoke to which Shellder bites on: its tail. Once Shellder bites the Slowpoke's tail, the two will evolve into a single Pokémon, Slowbro. If Shellder instead attaches itself to Slowpoke's head, it will create Slowking, a notably smarter Pokémon than the other two. This evolution can be reversed if Shellder falls off Slowbro's tail or Slowking's head. The evolution benefits both Pokémon: Slowpoke can now walk on its hind legs and Shellder can both eat the scraps of the Slowpoke, and finally move on land. The newly attached Shellder looks very different from its previous purple form, since it changes form when it bites.