Hail creates a hailstorm that lasts for 5 turns and induces these additional effects:
- All Pokémon except Ice types and those with the Ice Body or Snow Cloak abilities lose 1⁄16 of their max HP at the end of each turn.
- Pokémon with the Ice Body ability recover 1⁄16 of their max HP each turn.
- Pokémon with the Snow Cloak ability increase their evasion by 20%.
- Blizzard has 100% accuracy.
- The move Weather Ball changes to Ice type and doubles in power.
- The power of SolarBeam decreases by 50%.
- The moves Synthesis, Morning Sun and Moonlight recover 1⁄4 of the user's max HP (instead of the usual 1⁄2 HP).
- Castform changes to its Hail form.