Cloyster

Cloyster is one of the most unique Water-types in the UU metagame due to its secondary Ice typing and large movepool. It is the only Pokemon in the UU metagame to carry all of Spikes, Toxic Spikes, Rapid Spin, and Explosion. These great support moves are backed up by an excellent Defense stat, although its HP and Special Defense are quite pathetic in comparison. While its Ice typing sets Cloyster apart from other Water-types in the metagame, it is often more hurtful than helpful defensively. It gives it two more weaknesses, including one to Stealth Rock, and causes it to lose many resistances that a pure Water-type would otherwise boast. Offensively, Cloyster's STAB Ice Shard is quite useful for taking out faster, frailer Pokemon. Cloyster's decent offensive stats ensure that many Pokemon will have trouble trying to switch into his Surfs and Rock Blasts, especially frail Ghost-types trying to block Rapid Spin.