Changes the weather to rain for five turns, during which Water moves inflict 50% extra damage, and Fire moves inflict half damage.

If the user is holding Damp Rock, this effect lasts for eight turns.

Thunder has 100% accuracy. If the target has used Detect or Protect, Thunder has a (100 - accuracy)% chance to break through the protection.

Solar Beam has half power.

Moonlight, Morning Sun, and Synthesis heal only 1/4 of the user’s max HP.

Pokémon with Swift Swim have doubled original Speed.

Pokémon with Forecast become Water.

Pokémon with Dry Skin heal 1/8 max HP, Pokémon with Hydration are cured of major status effects, and Pokémon with Rain Dish heal 1/16 max HP at the end of each turn.