I have an amoonguss with hustle, Is this normal?

Question

I caught an amoonguss with hustle in a hidden grotto but in the dex it doesn't have that ability

Comments

The only thing that should have Hustle from Hidden Grottos are Nidiran & Combee.

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that happened to me too

Answer 1

No, it isn't normal. The hidden ability it should have is Regenerator.
Source: http://pokemondb.net/pokedex/amoonguss