When Hail is used, a hailstorm will begin on the field. This effect will last for 5 turns. This clears any other type of weather.
While Hail is in effect, all Pokémon not of the Ice type will be damaged for 1/16 of their maximum HP at the end of each turn. Synthesis, Morning Sun and Moonlight will recover only ¼ of the user's maximum HP. Additionally, Acufront and the move Weather Ball become Ice-type.
Pokémon with the Ice Body Ability recover 1/16 of their maximum HP each round. Pokémon with the Snow Cloak Ability increase their evasion by 20%. Pokémon with the Slush Rush Ability have their speed doubled. If an Icy Rock is held by the Pokémon using Hail at the time of use, the duration of Hail will increase from 5 to 8 turns.