Where can I find a black sludge in ORAS?

Question

I need one for my competitive team and a black sludge is one of the items I can't find. Can I have some help?

Answer 1

You have to uses Thief, Covet, Trick or Switcheroo to pinch it off of wild Grimer, Muk, Trubbish, and Garbador. They have a 5% chance of holding a Black Sludge — use the DexNav to search until you find one holding the item.

Source

Comments

Alternatively you can use a Pokémon with Frisk and catch it.