Clamperl @ Deep Sea Tooth  
Ability: Rattled  
Level: 5  
EVs: 76 HP / 248 SpA / 180 Spe  
Timid Nature  
IVs: 1 Atk / 30 SpA  
- Shell Smash  
- Steam Eruption  
- Ice Beam  
- Hidden Power [Electric] / Protect  
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Overview:
Clamperl's signature item Deep Sea Tooth boost its already good Special Attack to a monstrous level. This trait in conjunction with good coverage option and Shell Smash turns it into a potent sweeper. However, Clamperl is rather frail, which is further held back by its inability to hold Eviolite, this leaves it hard for Clamperl to set-up and more vulnerable to priority moves after setting up. Using Clamperl is also required a bit of support to make it effective, through Memento or Screens,weakening its checks and some Knock Off absorber due to its reliance on its item, thus it faces competition from other Shell Smash users like Shellder, Tirtouga and Omanyte, which boast less vulnerability to Knock Off, wider set-up opportunities and some resilient to priority move in case of the latter two.