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Effect / Mechanics
Held: Sunny Day by the holder lasts 8 rounds instead of 5.
Source: PokeAPI
In-game description
"An item to be held by a Pokémon. It extends the duration of the move Sunny Day when used by the holder."
Properties
Holdable Holdable (Active) Underground
Fling Power
60 Power
Power of the move "Fling" when using this item.