I have a Muk with Acid Armor and been trying the Mirror Herb method with no success. Do I need a Skrelp with Acid Armor or is chain breeding really the only way?
Goodra doesn't get Acid Armor as an Egg Move in Gen 9. The only way to have it learn Acid Armor is to use Move Relearner while it's still a Sligoo.
Source 1 Source 2
Hope I helped.
