A Pokémon with the Simple Ability has their statistical modifications doubled.
For example, if a Pokémon with Simple uses Harden, it will increase its Defense by two stages instead of the normal one. A Pokémon with Simple is still limited to a maximum of six stage increases or decreases. If a Pokémon with Simple is Baton Passed stat increases or decreases, these are doubled upon being received. Conversely, if a Pokémon with Simple Baton Passes stat increases or decreases to another Pokémon, they return to their normal levels upon being received.
Simple doesn't have an effect in the overworld.
Pokémon With Simple
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