Millis Steel

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Millis Steel
ミリス·スティール Millis Steel
Millis Steel M17.png
Millis Steel
Gender Female
Hometown Unknown
Region Kalos
Relatives Argus Steel (father)
Anime debut Diancie — Princess of the Diamond Domain
English voice actor Brittney Lee Hamilton
Japanese voice actor Shōko Nakagawa

Millis Steel (Japanese: ミリス·スティール Millis Steel) is one of the secondary antagonists of Diancie and the Cocoon of Destruction. She is the daughter of master thief Argus Steel and works with her father to obtain Diancie's diamonds.

Spoiler warning: this article may contain major plot or ending details.

In the movies

Millis debuted at the end of Diancie — Princess of the Diamond Domain, monitoring Diancie via a secret spy feed recorded by her father's Honedge.

In Diancie and the Cocoon of Destruction, Millis opened a door to the clock tower in Avignon Town in order to help Diancie escape from Team Rocket. Then, she returned to Argus's airship to inform him about Diancie's progress.

Later, when Merilyn and Riot attacked Ash and his friends, Millis taunted them both to allow the group time to escape. When Diancie was bathed by Xerneas's Fairy Aura in Allearth Forest, Millis and Argus arrived. Millis revealed that she only helped Diancie because she was feeling sorry for her. Merilyn and Riot also arrived and the thieves fought over Diancie. They took their fighting to an underground pool where Yveltal slept in cocoon form, where the fighting eventually awakened the Destruction Pokémon.

During Yveltal's rampage, Millis, Argus, and Aegislash narrowly survived Yveltal's Oblivion Wing, but their Pokémon didn't, though Chesnaught protected them with Spiky Shield. When they returned to the airship to fire missiles at Yveltal, they were petrified by its Oblivion Wing. Millis, Argus, and their Pokémon were revived later on by Xerneas's Geomancy.

After these events, Millis and her father gave up their criminal life and opened a chocolate shop.


As the daughter of master thief Argus Steel, she has taken pride in assisting him. When Diancie was unable to make diamonds properly, Millis took on the facade of having Diancie get to safety. However, after Diancie was bathed by Xerneas's Fairy Aura, Millis's facade disappeared and continued her goal of getting Diancie. She still retained her antagonistic personality during Yveltal's onslaught despite being saved by Ash and his friends.

Millis would often tease Argus about his chocolate-eating habits.


This article is missing information on this character's Japanese voice actor.
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On hand

Millis Steel's Chesnaught
Chesnaught is Millis's only known Pokémon. It was first seen with its Trainer when she helped Diancie escape the clock tower.

Later, Chesnaught fought with the other thieves's Pokémon where it was taken to an underground pool in Allearth Forest. During Yveltal's onslaught of the Allearth Forest, Chesnaught used Spiky Shield to protect itself from Yveltal's Oblivion Wing but became petrified by Oblivion Wing. Later, it was revived by Xerneas's Geomancy.

Chesnaught's known moves are Pin Missile, Vine Whip and Spiky Shield.

Chesnaught is confirmed male in the English dub only.

Debut Diancie and the Cocoon of Destruction
Voice actors
English H.D. Quinn


Argus Steel's Honedge
In Diancie — Princess of the Diamond Domain, Millis borrowed Honedge from her father Argus Steel to spy on Diancie.

None of Honedge's moves are known.

Debut Diancie — Princess of the Diamond Domain
Voice actors
English Tom Wayland
Argus Steel's Doublade
Millis used her father's Doublade throughout the movie as a means of aerial transport.

None of Doublade's moves are known.

Debut Diancie and the Cocoon of Destruction
Voice actors
English Tom Wayland

Voice actors

Language Voice actor
Japanese 中川翔子 Shōko Nakagawa
English Brittney Lee Hamilton
Danish Tillie Bech
Italian Martina Felli
Korean 안영미 An Yeongmi
Polish Joanna Pach
Brazilian Portuguese Kate Kelly
Spanish Latin America Mayra Arellano
Spain Pilar Aguado

In the manga

Movie adaptations

Millis appeared in the movie adaptation of the 17th movie.


Millis Steel's Chesnaught
Chesnaught is Millis's only known Pokémon.

Chesnaught's known moves are Pin Missile and Spiky Shield.

Debut Diancie and the Cocoon of Destruction


Language Name Origin
Japanese ミリス·スティール Millis Steel From steel and steal.
English Millis Steel Same as Japanese name.
French Mila D'Acier Similar to her Japanese name. Acier is French for steel.
German Gitta Stahl Stahl is German for steel.
Italian Milli Acciaio Similar to her Japanese name. Acciaio is Italian for steel.
Spanish Millis Hurtado From hurtar (steal).
Korean 밀리스 스틸 Millis Steel Transliteration of her Japanese name
Chinese (Mandarin) 彌莉絲·大盜 Mílìsī Dàdào Partial transliteration of her Japanese name. Her surname literally means thief.
Chinese (Cantonese) 彌莉絲·史提爾 Mèihleihsī Sítàihyíh Mandarin-based transliteration of his Japanese name

Movie characters
Human protagonists
AliceAsh Ketchum (M20)AudreyBarazBiancaCallahanCarlitaCoreyDamosDianaDianeEricFergusHarrietJack WalkerJuanita
KarlKathrynKidd SummersKimiaKokoLisaLizabethLorenzoMannesMarenMargoMelodyMerayNeeshaNewton Graceland
Professor LundRafeRaleighRebeccaRisaRowenaSamSheenaSidSir AaronSorrelTonioTorenTory LundTowaVerityYuko
Human antagonists
AlvaAnnieArgus SteelButlerCherieCrossDamonDoctor ZedGalenGooneGrings KodaiIron-Masked MarauderLawrence IIILeviMarcus
MerilynMillis SteelMolly HaleOakleyPokémon huntersPokémon poacherRiotThe PhantomZero
ArceusArticunoCarbinkCelebi (M04)Celebi (M13)CobalionDadaDarkraiDeoxysDialgaDiancieEntei (M03)Entei (M13)GenesectGiratina
Ho-OhHoopaJirachiKeldeoKyuremLatiasLatiosLucarioLugiaMagearnaManaphyMarshadowMew (M01)Mew (M08)Mewtwo (M01)
Mewtwo (M16)MoltresPalkiaPikachu (M20)PikachutwoRaikouRayquazaRegiceRegirockRegisteelReshiramShayminSlowking
Spiky-eared PichuSuicune (M04)Suicune (M13)TerrakionUnownVictiniVirizionVolcanionXerneasYveltalZapdosZekrom
AliciaAllegraAstridBanksBaron AlbertoBlock BotBogieBonjiCarolChrom MolybdenumCTV news crewDabuDavidDionaDonuke
Dr. FujiDundeeFlamelFreddyGabuGhrisGlacineGodeyGurūHeroes of Truth and IdealsHoytInfiJasonJennyJoeJudy
KaiKakoKanataKatoKellieKevinKikoKing of the People of the ValeKyleLaylaLeekuLucianneLuisLuisaMakoMalin
ManukeMarcus's soldiersMauryMayor OliverMeredithMeta GroudonMewtwo's creatorsMiaMilesMimiMirandaMisakiMoose
Mother and daughterMr. WhiteNevaNikolaOld Man DomŌyamaPegPeople of the WaterPhossa MolybdenumPokémon Baccer teams
Queen IleneQueen RinRavineRaymondRickRossSchuylerSharonShepShunSpencer HaleSylvanTakaTammyTanner
TappTatsukiThe Marina GroupTobiasTownesUschiZabu

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