かんそうはだ

Causes 1/8 max HP in damage each turn during strong sunlight, but heals for 1/8 max HP during rain. Increases damage from fire moves to 1.25×, but absorbs water moves, healing for 1/4 max HP.

"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."