Dry Skin

Introduced in Generation IV

This Pokémon takes 1/8 of its maximum HP in damage after each turn during strong sunlight, but it heals for 1/8 of its HP each turn during rain. This Pokémon takes 1.25× as much damage from Fire-type moves, but whenever a Water move hits it, it heals for 1/4 its maximum HP instead.

“Restores the Pokémon's HP in rain or when it is hit by Water-type moves. Reduces HP in harsh sunlight, and increases the damage received from Fire-type moves.”