How to breed Acid Armor for my Magcargo (Slugma) in XY?

Question

Tell me some compatible parents.

Answer 1

Muk/Grimer!

Muk learns Acid Armor at level 42 (Grimer at level 40) and is in the Amorphous egg group, breed a male Muk with a female Magcargo/Slugma and BOOM Acid Amror Magcargo.

Comments

But I'm playing X/Y. Where I can find Muk or Grimer or is there other compatible parents?

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You can only get Muk in the Poison Friend Safari, and unfortunately no, there arent any other compatible parents.

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wow I didn't know you can get fully evolved pokemon (excluding baby pokemons evolutions) from eggs, I wanna try that!

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Poison Friend Safari? How I can get there...?

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http://www.serebii.net/xy/friendsafari.shtml

Answer 2

Breed your Macgarco with a Muk that has Acid Armor.

Source: http://bulbapedia.bulbagarden.net/wiki/Acid_Armor_(move)