Mimikkyu

Mimikkyu is a small Ghost-type Pokémon whose true body is hidden beneath an old rag fashioned to resemble Pikachu. Lonely and weakened by sunlight, it is rumored to use the disguise for protection and hopes its Pikachu-like appearance will help it make friends. If the rag is damaged, Mimikkyu spends the night repairing it and may seek revenge on whoever caused the damage.