Clear Body prevents stat reduction caused by another Pokémon's move or ability. Stat reductions can only be caused on Pokémon with this ability if they are self-inflicted, such as from moves like Superpower or Hammer Arm and it does not prevent stat increases like from the moves Flatter or Swagger.
Romaji: Shiroi Kemuri) is an ability introduced in the third generation with the same effect as Clear Body in battle. With Pokémon Emerald, it gained the field effect of lowering the encounter rate by 50% if the Pokémon with it is leading. It was exclusive to Torkoal until Generation V.
Gen III - Prevents ability reduction.
Gen IV (DPPt) - Prevents the Pokémon's stats from being lowered
Gen IV (HGSS) - Prevents its stats from being lowered
Gen V / VI - Prevents other Pokémon from lowering its stats.