Nature reference
Impish Nature Pokémon: +Defense, −Sp. Atk
Impish raises Defense by 10% and lowers Sp. Atk by 10%. HP and the other stats are unchanged.
Increases+Defense
Decreases−Sp. Atk
When does Impish fit?
Consider Impish for Pokémon built to take physical hits. It fits best when special damage is not part of the plan.
The right choice depends on the Pokémon’s moves, role and battle format. A nature does not change types, abilities or move availability.
Impish mint and flavors
A Impish Mint applies +Defense and −Sp. Atk stat effects in games that support mints. A mint does not change the Pokémon’s original nature, its flavor preferences, or the nature it passes through breeding.
A Pokémon whose original nature is Impish likes Sour flavors and dislikes Dry flavors.