It later allies with Team Rocket when it sees them fighting Ash Ketchum's Pikachu, expressing its hatred for Pikachu as the reason it emulates the Pokémon's appearance. When the two of them begin to battle, Meowth lifts Mimikyu's disguise, and is nearly killed by the sight of its true appearance. Meowth, being able to understand Mimikyu, is terrified by the unheard horrifying things it says. Mimikyu appears in the anime Pokémon: Sun & Moon, encountered by Jessie, James and Meowth of Team Rocket. Mimikyu also appears in Pokémon Rumble Rush, Pokémon Shuffle, Pokémon Masters EX, Pokkén Tournament DX and Pokémon Go. Mimikyu is also present in Pokémon Scarlet and Violet, found near ruins and in a forest called Tagtree Thicket.

Mimikyu appears in Pokémon Sword and Shield during foggy weather, in a section of the Wild Area named Giant's Mirror. It appears as a totem Pokémon in both Sun and Moon, and Ultra Sun and Ultra Moon. It can be found on Ula'ula Island in the Abandoned Thrifty Megamart. In Ultra Sun and Ultra Moon, Mimikyu can use an exclusive Fairy-type Z move, 'Let's Snuggle Forever', that requires Mimikyu to know the move 'Play Rough' and hold a Mimikium Z. Its ability, 'Disguise', allows it to avoid damage from an enemy attack once during a battle. It changes its appearance when hit by an attack.

Mimikyu first appears in Pokémon Sun and Moon as a dual-type Ghost/Fairy Pokémon. The cloak is so shabby and worn that it is almost unrecognizable as Pikachu, but Mimikyu wears it in the hopes of being loved and accepted, as its true form is said to be too horrifying to behold. During some attacks, it will occasionally extend a black appendage from beneath the disguise. A pair of beady black eyes can be seen in the lower area of its costume, and a vague semblance of a lower body can be seen at its costume's hem. The cloak is shaped like Pikachu, with black eyes, red cheeks, a black mouth, a lightning bolt-shaped stick that resembles a tail, and ears that are black on the top. Mimikyu is a small Pokémon, standing 8 inches (0.2 m) tall, and is hidden underneath a tattered cloak that is said to be made of straw.

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