When a Pokémon with this Ability is hit by a move that makes contact, the Ability of the attacking Pokémon will become Mummy. Besides spreading Mummy in battle, the Ability does not have any other effect.
If a Pokémon with Rock Head uses a recoil contact move on a Pokémon with Mummy, the attacking Pokémon will take recoil damage. If a Pokémon with Parental Bond uses a contact move on a Pokémon with Mummy, the Pokémon's Ability will be changed, then it will continue to hit a second time.
Outside of battle
Mummy has no effect outside of battle.
Pokémon with Mummy
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| Please note that this is only 100% accurate to Generation VI games.