Generation Iv
Dry Skin
Reduces HP if it is hot. Water restores HP.
Detailed Effect
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.
Pokémon With Dry Skin
7 canonical Pokémon forms can have this Ability.
Paras 
Parasect 
Croagunk 
Toxicroak 
Helioptile 
Heliolisk 
Jynx 
