Sunny Day (move)

Sunny Day is a -type status move that changes the weather. It is TM11 and can be found inside the Wild Plains.

Effect
When this move is used, the sunlight will brighten the field. This effect will last for 5 turns. This clears any other type of weather, but fails if it's already sunny.

While Sunny Day is in effect, the base power of Fire-type moves will be increased by 50%, and the base power of Water-type moves will be decreased by 50%. In addition to this, the moves ,, and  will recover ⅔ of the user's HP, and  will not require a turn to charge. The accuracy of  and  is also lowered to 50%.

Additionally,  become Fire-type.

If a Heat Rock is held when Sunny Day is used, the duration of sunlight lengthens from 5 to 8 turns. Additionally, the following Abilities will have the effects listed while the sun is shining:
 * Pokémon with the  Ability will have their Speed doubled.
 * Pokémon with the  Ability will lose ⅛ of their maximum HP at the end of each turn
 * Pokémon with the  Ability will have their Special Attack raised by 50% and lose ⅛ of their HP each turn
 * Pokémon with the  Ability will be immune to being inflicted with non-volatile status conditions
 * Pokémon with will regain 1/8 of its maximum HP at the end of each turn.
 * Pokémon with will never fail to restore a Berry.

now raises the user's Attack and Special Attack by two stages instead of just one.