Pokémon breeding/Games/How to breed/Inheriting Natures

In, if the mother (in a male-female pair) or (in a pair that includes Ditto) is holding an Everstone, the baby has a 50% chance of inheriting that Pokémon's Nature.

In Diamond, Pearl, and Platinum, inheriting Natures remains the same as in Emerald, except that passing on Natures via an Everstone will not work if the Pokémon have different original languages.

In HeartGold and SoulSilver, whichever Pokémon is holding an Everstone will have a chance of passing down its Nature, regardless of gender, or whether it is breeding with a Ditto.

In Black and White, inheriting Natures remains the same as in HeartGold and SoulSilver, except that passing on Natures via an Everstone will now work even if the Pokémon are from different original languages.

From onward, if one parent holds an Everstone, its Nature will always be passed down. If both parents are holding an Everstone, a parent's Nature will still always be passed down, but which parent's Nature is passed down is randomly determined.