Millis Steel

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 's diamonds.

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

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. She then returned to Argus's airship to inform him about Diancie's progress.

Later, when Merilyn and Riot attacked and, Millis taunted them both to allow the group time to escape. When Diancie was bathed by 's 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 slept in cocoon form, where the fighting eventually awakened the Destruction Pokémon.

During Yveltal's rampage, Millis, Argus, and narrowly survived Yveltal's, but their Pokémon didn't, though  protected them with. 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.

Character
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 's, Millis's facade disappeared and continued her goal of getting Diancie. She still retained her antagonistic personality during 's onslaught despite being saved by and.

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

In the movie adaptations
Millis appeared in of the 17th movie.

Names
Gitta Stahl Millis Steel/Millis Hurtado Mila D'Acier Milli Acciaio ミリス・スティール 彌莉絲‧史提爾