If Shedinja used a Physical move on a Yamask or Cofagrigus, would it be affected by Mummy?
Shedinja's ability would become mummy. The Bulbapedia page was wrong and was updated in 2012. source source (also mummy is technically activated by contact moves, which are not always physical)
>Multitype, Wonder Guard and Mummy itself are the only Abilities not affected by Mummy.
Source: Bulbapedia/ Mummy ___ Nothing would happen.
After taking damage from a Direct Attack, changes the attacker's Ability to Mummy. (Does not affect Wonder Guard or Multitype.)
Source by marriland.com