PKMN.NET :: Dex :: Power Belt
DEX -
ITEMS: Power Belt

In-game description: A Pokémon hold item that promotes Defense gain on leveling, but reduces the Speed stat.
Price: 3000

Technical explanation and other notes
Defense EV gains are multiplied by four, but speed is halved while the item is held.

Fling: 70 base power. Side effect: No additional effect