Floatzel (C+ or C)
Obtainable: Before Gym 1, Event
Abilities: Swift Swim if there's Rain Dance support, Water Veil if you're afraid of getting burn (i don't recommend it)
Moves: Crunch/Ice Fang (Relearn), Aqua Jet/Aqua Tail/Pursuit/Double Hit/Quick Attack for physical, Agility for setting up
Useful For: Not much. It can be useful for Valerie thanks to Whirlpool because of her field, but there're just so many better choices than this. Can be nice for Amber, Narcissa (Crunch).
Summary: A mediocre mon with mediocre stats and a mediocre movepool, and since there're just so many better choices for a Water slot for your team (Swampert, Ludicolo, Greninja, ..., Floatzel just doesn't have much to testify using it. Though it has certain niches (Whirlpool for Valerie's Milotic), Floatzel just isn't a good choice.