He's wearing a rag that he tried to make look like Pikachu. Although it's a quiet, lonely Pokémon, if you try to look at what's under its rag, it will resist violently. A scholar who saw what was under its rag died from the shock. It belongs to team Rocket's Jessie and James. Team Rocket's Meowth is afraid of it because he has seen under It's rag multiple times and fainted every time. When its disguise is busted, Mimikyu spends all night patching it up with great difficulty, crying.