Generation Iii
Water Veil
Prevents burns.
Detailed Effect
This Pokémon cannot be burned. If a Pokémon is burned and acquires this ability, its burn is healed; this includes when regaining a lost ability upon leaving battle.
Pokémon With Water Veil
13 canonical Pokémon forms can have this Ability.

Goldeen 
Seaking
Wailmer
Wailord
Finizen
Mantine
Huntail
Buizel
Floatzel
Finneon
Lumineon
Mantyke
Dondozo