Is there any item which boosts the power of Flying-type moves?

Question

Like NeverMeltIce for ice-type and Fist Plate for Fighting Type...

Answer 1

Sky Plate and Sharp beak both raise the power of Flying type attacks by 20%.

Comments

A Flying Gem will boost the power of a Flying-Type move by 50%, but only once.

Answer 2

Flying Gem: One-time use; boosts a Flying-type move's power by 50%
Flyinium Z: Upgrades damaging Flying-type moves into Supersonic Skystrike; turns status Flying-type moves into their respective Z-Moves
Sharp Beak: Boosts the holder's Flying-type moves by 20% (10% in Generations II and III)
Sky Plate: Boosts the holder's Flying-type moves by 20%

Flying-type items (Bulbapedia)

Answer 3

The Sky Plate raises the power of flying tyype moves

Comments

Thanks... and, could you tell me where is it in platinum?

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Its near the pokemo league and can  be found underground.

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Can't you get a Sharp Beak too? I remember getting one from a lady in my old Pokemon Gold game...