Hydration

 is a Pokémon ability introduced in the fourth generation. It heals the users in the rains.

Description
Pokémon with this ability will heal status conditions at the end of the turn while it is raining. If it cures a status condition, it does so before burn or poison damage is dealt on that turn. Pokémon who are made drowsy by Yawn will not fall asleep until after Hydration takes effect, and as such, will not be healed until the end of the next turn.

Pokémon with Ability

 * Seel
 * Dewgong
 * Wingull
 * Phione
 * Manaphy
 * Tympole
 * Palpitoad
 * Alomomola
 * Shelmet
 * Accelgor
 * Goomy
 * Sliggoo
 * Goodra

As a Hidden Ability

 * Lapras
 * Vaporeon
 * Smoochum
 * Barboach
 * Whiscash
 * Gorebyss
 * Luvdisc
 * Ducklett
 * Swanna