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

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

Technical explanation and other notes
Special attack EV gains are multiplied by four, but speed is halved when held.

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