Mimikins was first seen in the library, where it listened to the story Acerola was reading to the children. After Greedy Rapooh took hold of Acerola and flew into the sky, it chased after Gengar. When it caught up to Gengar, it attacked Gengar with Shadow Claw in vain. After Team Rocket had defeated the Greedy Rapooh, it awarded a Mimikium Z to Jessie. When Jessie asked Acerola, why Mimikins was floating, she said that this Pokémon is already a ghost of a deceased Mimikyu.
When Ash encountered Acerola, he was interested in Mimikins's appearance, and was told it was actually a ghost. Mimikins played with Ash's Pokémon, and later glared at Nanu, trying to make him snap out of his laziness to accept Ash's challenge. Mimikins floated around Acerola, who took Ash to see Tapu Bulu. It also went with Acerola to see the battle between Ash's Pikachu and Jessie's Mimikyu. Mimikins stood by Acerola, who was the judge for the Grand Trial between Ash and Nanu.
Acerola and Mimikins were at the Ruins of Abundance, where they shared their Ultra Aura to Necrozma. Acerola and Mimikins visited the Pokémon School on Melemele Island, where they met Ash and his classmates. Acerola introduced Mimikins, and upon mentioning it was an actual ghost, Ash's classmates became terrified of it. To help Lana out, Acerola decided to stay a bit and make a haunted house for her sisters, Harper and Sarah. However, a group of Ghost-type Pokémon appeared, as Acerola feared Mimikins attracted these Pokémon. The Ghost-type Pokémon played around with Harper and Sarah, and lulled everyone to sleep in a world, where the heroes had to rescue Harper and Sarah. Thus, Mimikins helped them by tracing these Ghost-type Pokémon inside that world, until Komala woke them up.
After Acerola registered in the Alola Pokémon League, she and Mimikins greeted Ash and his friends. Later, when Acerola won the first round, she learned that she would face Kiawe in the next round, and asked Mimikins how fun this could be. Before the next round of battles began, Mimikins was with Acerola, who visited her friends, and inspired Kiawe to do his best in their battle. Later, Mimikins was beside Nanu, as they watched Acerola's battle against Kiawe. Acerola and Mimikins were among the audience watching the semi-finals, featuring Gladion and Kiawe. Later, Acerola and Mimikins were watching Ash's battle against Guzma.
- In addition to being part Ghost-type, Mimikins is also an actual ghost of a deceased Mimikyu.
- Mimikins and Kimia's Gardevoir are so far the only Shiny Fairy-type Pokémon seen in the anime.
- ^ SM073: Why Not Give Me a Z-Ring Sometime?
- ^ SM074: Tough Guy Trials!
- ^ SM075: Some Kind of Laziness!
- ^ SM076: A Battle Hand-Off!
- ^ SM077: Guiding an Awakening!
- ^ SM088: Full Moon and Many Arms!
- ^ SM090: Securing the Future!
- ^ SM094: A Haunted House for Everyone!
- ^ SM129: Battle Royal 151
- ^ SM131: The Battlefield of Truth and Love!
- ^ SM135
- ^ SM136
- ^ SM137