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Heavy Rain

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The Heavy Rain weather condition was introduced in Generation II. It can be brought about by use of the move Rain Dance (TM18) or by the Drizzle ability.

Heavy Rain will not damage any type of Pokémon in between turns in battle (unless an ability would cause HP loss).

A Pokémon holding the item Damp Rock will prolong the duration of Heavy Rain for three more turns than normal, the average being three to five turns.

Effects in Battle

Associated Abilities

Ability Weather Effect
Drizzle This ability will summon Heavy Rain which will last the entirety of the battle, unless another weather condition is introduced to the battlefield or its effect is nullified by Cloud Nine or the Air Lock abilities.
Dry Skin A Pokémon with this ability will recover 12.5% of it's maximum HP at the end of every turn. It will also restore 25% of its maximum HP if attacked with Water-type moves.
Hydration This ability will remove any status condition when in battle as long as it is raining. This includes removal of Sleep after use of Rest.
Rain Dish 6.25% (1/16) of this Pokémon's maximum HP is restored at the end of every turn when it is raining.
Swift Swim The Speed stat of Pokémon with this ability is doubled.

Associated Moves

Move Weather Effect
Rain Dance This move will summon (or prolong) Heavy Rain for 5 turns.
Morning Sun 25% (1/4) of the user's HP is restored, when Morning Sun used.
Moonlight 25% (1/4) of the user's HP is restored, when Moonlight used.
Synthesis 25% (1/4) of the user's HP is restored, when Synthesis used.
SolarBeam Solarbeam's base power drops 50% (from 120 to 60).
Thunder Thunder's accuracy is boosted to 100% (for a gain of 30% it's initial accuracy of 70%) . In Diamond and Pearl, it has the potential to break through Detect and Protect 30% of the time.
Hurricane Hurricane's accuracy is boosted to 100% (for a gain of 30% it's initial accuracy of 70%) .
Weather Ball Weather Ball becomes Water-type. Its base power doubles from 50 to 100. Castform will receive STAB from Weather Ball in Heavy Rain.