Huntail.

Overview: Oh Huntail. Never seen much action back in the day. And now, one thing changed. Shell Smash. This makes Huntail an offencive monster. But even this blessing has its downfalls. It is outclassed by Cloyster in the higher tiers, but oh well. It is a great force in Underused.

Abilities:
Swift Swin: Oh Shell Smash and Swift Swim? And with Drizzle? Overused here I co- wait, Drizzle snd Swift Swim Teams are banned? Yeah. Not very appealing now...
Hydration: Stops paralisys, stops burn, legal with Drizzle, very good ability...

Movesets:

HUNTAIL SMASH!
Ability: Hydration
Item:Life Orb
-Shell Smash
-Ice Fang
-Waterfall
-Crunch/Return
252 Atk, 4 Def, 252 Spe

Simple and lethal. Shell Smash makes your offences sky high, making you a dangerous sweeper. Waterfall is for STAB, and Ice Fang covers Grasses and Dragons. Crunch can help with coverage, but Return is the stronger mive. Either is fine...