Why does my Dustox lose it's hidden ability upon evolution?

Question

I keep hatching wurmple with the run away ability, but every one that evolves into Cascoon/Dustox has shield dust. The parents are two Beautifly with rivalry. Does using Beautifly have some affect on keeping the HA?

Answer 1

It is because of Silcoon and Cascoon not having any HA. When the Wurmples evolve, they lose their HAs and they are stuck with Shed Skin. After they evolve into Dustox, they love Compoundeyes and are stuck with Shield Dust.

Source: Experience/Serebii

Comments

They love Compoundeyes? x)

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well here's a 'what the...' for you then: I've evolved multiple silcoons into Beautifly with Rivalry, and since asking this question, I've evolved two Cascoons into Dustox's with compound eyes, so what on earth is going on here?

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o_o Okay...

Answer 2

This is because when Wurmple evolves into Silcoon/Cascoon, it loses it's Hidden Ability because Silcoon and Cascoon don't have a Hidden Ability. Since it has it's normal ability, when it evolves again the Dustox will have it's normal ability, like it previously did.

You obviously got the Beautifly from a Friend Safari.
The only way you can get a Hidden Ability Dustox is to transfer one from B/W. Sorry.

Hope I helped. :)
Source: Serebii

Comments

*says in sonic voice* You're too slow!