Sunny Day boosts the power of all Fire-type moves by 50% and cuts the power of all Water-type moves by 50%. It also changes the accuracy, charge time, healing, stat boosts, or type and power of several specific moves. In the cited main-series mechanics, sunlight lasts five turns.
Sunny Day’s effect on Fire- and Water-type moves
While sunlight is active, Fire-type move power increases by 50%, and Water-type move power decreases by 50%. These are type-wide effects: they apply to moves of those types, not only when the user is a Pokémon of the same type. Pokémon Database lists Sunny Day as TM049 in Scarlet and Violet and describes it as powering up Fire-type attacks while lowering Water-type attack power.
Specific moves that change in sunlight
Thunder and Hurricane: lower accuracy
Thunder and Hurricane have 50% accuracy in sunlight, according to the cited move references. Pokémon Database and Bulbapedia list this weather interaction.
Solar Beam and Solar Blade: no charge turn
Solar Beam and Solar Blade can attack immediately in sunlight instead of spending a turn charging.
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Growth: a larger stat increase
From Generation V onward, Growth raises the user’s Attack and Special Attack by two stages each in sunlight. The two-stage effect is generation-specific; check the game you are playing if you need the precise behavior in an older title.
Synthesis, Morning Sun, and Moonlight: more HP restored
In sunlight, each of these moves restores two-thirds of the user’s maximum HP, rather than the usual one-half described in the cited references.
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Weather Ball: Fire type and double power
Sunlight changes Weather Ball to a Fire-type move and doubles its power.
Other sunlight effects
Sunny Day can affect Pokémon abilities and forms as well as moves. The cited references list Chlorophyll doubling Speed, Dry Skin causing HP loss in sun, Leaf Guard preventing major status conditions, Solar Power raising Special Attack, and sun-related changes to Cherrim and Castform. These effects can depend on the game or generation. The references also state that Pokémon cannot be frozen while sunlight is active.
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Which game’s rules apply?
Sunny Day was introduced in Generation II. The broad Fire- and Water-type power changes are described in both historical and current references, but individual move and ability interactions can vary by generation. For Scarlet and Violet, the in-game description says: “The user intensifies the sun for five turns, powering up Fire-type attacks. The sunlight also lowers the power of Water-type attacks.” Use the specific game’s move description or mechanics when an edge case matters.
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