All Pokemon except Rock, Ground and Steel types and those with the Sand Veil, Sand Rush or Sand Force abilities, lose 1⁄16 of their max HP at the end of each turn.
Pokemon with the Sand Veil ability increase their evasion by 20%.
Pokemon with the Sand Rush ability double their speed.
Pokemon with the Sand Force ability increase the power of Rock, Ground and Steel type moves by 30%.
From Generation 4 onward, the Special Defense of Rock-type Pokemon is increased by 50%.
The move Weather Ball changes to Rock 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).