PKMN.NET :: Dex :: Metronome
DEX -
ITEMS: Metronome

In-game description: A Pokémon hold item that boosts a move used consecutively. Its effect is reset if another move is used.
Price: 200

Technical explanation and other notes
The power of a move is increased by 10% on every consecutive use, to a maximum boost of 100%

Fling: 30 base power. Side effect: No additional effect