( かるいし Pumice Stone )
The Float Stone (Japanese: かるいし Pumice Stone) is a hold item in Generation V, given by a man inside Drayden's house in Opelucid City in Pokémon Black and White. One can also be found in Twist Mountain in Pokémon Black 2 and White 2.
It's a very light stone which halves the weight of the Pokémon holding it. This reduces the damage taken by weight-based attacks such as Grass Knot and Low Kick. It also lowers the amount of damage done if the holder uses Heavy Slam or Heat Crash, and increases the damage done to the holder by it.