If the Pokémon holding this item creates harsh sunlight with the move Sunny Day, the Abilities Drought or Orichalcum Pulse, or the move Max Flare, it lasts eight turns instead of five turns. (Prior to Generation VI, it has no effect on Drought, which creates harsh sunlight with indefinite length in those games.)
In the Generation VII games, if harsh sunlight has its duration extended by the Heat Rock, the turn counter on the user interface for these effects will indicate that it lasts for 8 turns for the player whose Pokémon used the move, while it will display that it lasts for 5 turns for their opponent. After 5 turns of harsh sunlight have passed, the user interface will display that it lasts for 8 turns for both players.
||A Pokémon hold item that extends the duration of the move Sunny Day used by the holder.
|A Pokémon held item that extends the duration of the move Sunny Day used by the holder.
|An item to be held by a Pokémon. It extends the duration of the move Sunny Day when used by the holder.
||An item to be held by a Pokémon. When the holder changes the weather to harsh sunlight, the sunlight will persist for longer than usual.