Jessie's Mimikyu

"What it's saying is scaring me. It's better you don't know. Stop saying those scary things! It looks like Mimikyu hates Pikachu. Mimikyu isn't dressed as Pikachu just for fun. It seems to be the thing Mimikyu hates most. That is enough! I'm scared. You don't have to say anymore."

- Meowth about Mimikyu

Mimikyu (spelled Mimikkyu in Japanese) is currently one of Jessie's and Team Rocket's main Pokémon, and is a major antagonist in the Alola Region arc in Pokémon anime.

It is currently voiced by Billy Bob Thompson in the few moments that it "talks".

Appearance
Mimikyu has a rag over itself so that it can hide its true appearance. The reason for this other than hiding its actual appearance is also to show its hatred and wrathfulness against all things related to Pikachu. Similarly to the actual Pikachu, it has red/orange cheeks painted on the cloth, a black mouth that looks slightly distorted, two black eyes, and two ears.

Nothing is confirmed about how it looks behind the cloth other than that it apparently can cause people to die, or at the very least cause a terrifying traumatic nightmare experience after looking at it in its true form as seen with Meowth, and that it has a black claw and tail that it uses in battle.

First meeting with Team Rocket
Mimikyu was encountered by Team Rocket in the Alola Region in the third episode of the Sun and Moon arc.

At first, Jessie and James think that Mimikyu is an actual Pikachu, and this amazes them and encourages them to catch it

Jessie later notices that it isn't actually a Pikachu, nevertheless she still wants it, and after realizing that Mimikyu dresses up like Pikachu because of its hatred of it, Jessie decides to catch it.

Mimikyu doesn't want to be caught and the only thing it wants is death to all Pikachus, and after Team Rocket confronts Ash and Pikachu, Mimikyu attacks Pikachu without a second thought and dominates it.

He defeats all of Ash's pokémon, and this amazes Team Rocket even more and makes them even more encouraged to catch it.

Jessie tries using multiple Poke-Balls to catch it, but to no avail. She then snags James's limited edition Luxury Ball and successfully catches Mimikyu with it. Since then, Mimikyu has been Jessie's main battling Pokemon in Alola.

A Team-on-Team Tussle!
In this episode, Jessie and James are fighting against an Alolan Raticate in order to obtain the Darkinium Z, and while every Pokémon is failing at defeating the Raticate, Mimikyu is the challenge hard even for it to defeat, The Totem Raticate manages to slap Mimikyu away with its tail and it is about to defeat Team Rocket, when Mimikyu comes out of nowhere and attacks Raticate, which made Team Rocket win.

SM038
In this episode, Mimikyu is less dominant in battle, and Team Rocket is once again out seeking to get Pikachu.

It doesn't take much time before Kiawe uses his Turtonator and Firium Z, and it quickly tears the whole Team Rocket team apart and separates the Pokémon from Jessie and James, dragging Mimikyu rag away, which forces him to take a malasada bag on himself instead.

Jessie went to buy another rag for him after it.

Later in the episode, even though having a growing relationship with Jessie, it still denied her order on attacking Ash's Lycanroc, and attacked Pikachu instead.

Personality
Jessie's Mimikyu is a lot different than what the video games present.

They mention that Mimikyu is a tragic sad creature that pretends to be a Pikachu only because it wants to be as popular as Pikachu in the games. Considering the fact that if someone looks under the rag, the person dies. Jessie's Mimikyu is very different; it is extremely destructive, ruthless, and vicious. Whenever it sees a Pikachu, he will instantly attack it, and while the Pikachu are its main enemies, it won't hesitate to attack others too, as it once attacked a Popplio during a Pancake race contest for no apparent reason, and once attempted murder at Meowth. For the same reason as almost only attacking Pikachu, it won't occasionally follow Jessie's orders because it doesn't care.

It spends a lot of time outside his Pokéball despite it being a luxury one and does what he likes and even though it has a relationship with its trainer, it will often ignore his trainer's orders.

According to Meowth and Wobbuffet, who understand Pokémon speech, Mimikyu is very intimidating, dangerous, and cruel when talking, and they were both extremely disturbed by the words it used and apparently didn't even want to mention what he said. It loves scaring Meowth because of the fact that Meowth is deeply scared of him.

Trivia

 * Unlike all of Jessie's Pokemon, Mimikyu is truly evil and villainous as it is willing to kill Pikachu for it's own intent, having a dark personality and frightening Meowth to death. (not counting Wobbuffet who acts more of a recurring antagonist.)
 * Mimikyu holds the record of being the smallest Pokemon villain at a mere height of 0'08" (0.02 m) tall and a weight of 1.5 lbs (0.7 kg).