Sunny Day is a Fire-type move that changes the weather to sunny for five turns. If the user is holding a Heat Rock, the sun will last eight turns.
The sunny weather increases the power of Fire-type moves by 1.5× and decreases the power of Water-type moves to 50%. Synthesis, Moonlight, and Morning Sun will restore ⅔ of the user's HP, SolarBeam will not require a charging turn, the move Growth will boost the user's Attack and Special Attack by two stages, and the moves Thunder and Hurricane will have their accuracies lowered to 50%.
By TM for generation Galar