How do I pass down stealth rocks from swinub to pinplup?

Question

I have tried with both male and female combinations but it is still not working.

Answer 1

Piplup, nor Prinplup can learn Stealth Rock via breeding.

In Generation IV, it can learn Stealth Rock via TM76.
In Generation V, it can learn it via the Move Tutor.

Hope I helped. :)
Source: Serebii

Comments

What about empoleon?

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you can't breed an empoleon.  piplup will come out of the egg no mather what

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To add to Indigo's answer, if you breed a Female Swinub with a Male Prinplup the Swinub that hatches from the egg will have Stealth Rock as long as the Male Prinplup has it. But if you breed a Female Prinplup with a Male Swinub even if the Swinub has Stealth Rock the Piplup that hatches from the egg will not have Stealth Rock.

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'Cos Stealth Rock ain't one of it's Eggy moves. :3