Hydration is an ability introduced in Generation IV. So far, 1 Pokémon has this ability.
At the end of each turn, if it is raining, Hydration will cure the Pokémon of burning, sleep, poison, paralysis, or being frozen. If Hydration cures a Pokémon of burn or poison, it will do so before any burn or poison damage is dealt on that turn. It can be seen as a Rain counterpart to Leaf Guard.
Outside of battle
Hydration has no effect outside of battle.
Pokémon with Hydration