Breeding, passing down natures?

Question

I want a specific nature (calm) on my Pokemon. Instead of 1/30 random chance, what do I need for the mother Pokemon to hold to increase the chance to 50%?

Answer 1

Everstone.
In B/W2, its a 100% chance. So if the mother is Calm, the baby is Calm.

Comments

What if its a male and bred with ditty?

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Nature would be 1/30, as the female must hold the item.