Generation V
Mummy
Contact with this Pokémon spreads this Ability.
Detailed Effect
Whenever a contact move hits this Pokémon, the attacking Pokémon's ability changes to Mummy. Multitype is unaffected. If a Pokémon with Moxie knocks this Pokémon out, the former's ability will change without taking effect.
Pokémon With Mummy
2 canonical Pokémon forms can have this Ability.
Yamask 
Cofagrigus