'''Storm Drain''' (Japanese: '''よびみず''' ''Pump Preparation'') is an [[ability]] that ''draws all {{t|Water}} attacks to the Pokémon.'' Four [[Pokémon]] have this ability, all of them water type. In a [[double battle]], a Pokémon with this ability will force all water attacks to exclusively strike it; this ability is rendered ineffective in a [[Pokémon battle#1v1_Battles|single battle]]. Unlike {{a|Lightningrod}}, since no types are immune to Water, the four Pokémon with this ability take half or full damage from Water attacks, rendering it less useful in general than a Ground-type with Lightningrod. Having a Pokémon with the ability Storm Drain at the front of your party will also cause the chances of encountering a Water wild Pokémon to increase. It was introduced in [[Generation IV]].