Clamperl

Thanks to Clamperl's exclusive item Deep Sea Tooth, it can reach an insane 34 Special Attack. Using Shell Smash allows Clamperl to outspeed the entire unboosted LC metagame while also skyrocketing its Special Attack stat. However, Clamperl is quite frail, which makes it quite hard to set up a Shell Smash. Additionally, after it has used Shell Smash, its lowered defensive stats leave it incredibly vulnerable to priority attacks. It is also outclassed by Omanyte, which has a better typing, is less reliant on having a specific item, and is bulkier, allowing for easier set up. However, Clamperl does hit far harder and, unlike Omanyte, is not weak to Mach Punch or Vacuum Wave, which is more important than Omanyte's resistance to Flying-type attacks now that Gale Wings has been nerfed.