Generations III to V
Drizzle summons rain in battle as soon as a Pokemon with Drizzle enters the battle. Its effects are the same as the move Rain Dance, but instead of lasting for a limited amount of turns, it lasts for the whole battle (unless it is replaced by another weather condition). If a Pokemon with Drizzle is sent out in the same turn as another Pokemon whose Ability affects the weather, the slower Pokemon’s Ability will override the faster Pokemon’s Ability.
The rain now lasts only for five turns. This can be extended to eight turns if the Pokemon is holding a Damp Rock.
Outside of battle
Drizzle has no effect outside of battle.
Pokemon with Drizzle