Demon Queen Bansheera

Demon Queen Bansheera (大魔女 グランディーヌ Daimajo Gurandīnu, Grand Witch Grandiene) is the evil ruler of the Demon Clan and mother to the five siblings. The ultimate form of all Dark Aura energy in the universe.

History
She set everything up for her arrival in this reality on the day of the Grand Cross. However, Ash and his friends interrupted Jinxer's ritual and Bansheera ended up trapped half-way. Having failed, she ordered her sons and daughter to gather dark energy for her, until finally she took matters into her own hands and used the evil energies gathered to complete her passing.

In a cruel and cold act, Bansheera sends her third born son, Lokai, to his death to accomplish her goals; revealing to Diabolico that she never really cared for the well-being of her children. She believed they would turn on her, like Triskull did, and deliberately sent them out to die. She also admitted that she only used them to bring herself into the human world.

She tried to kill Serena, Jacob, and Sally by burning them to death through sacrificing Diabolico, but Ash and his Pokémon destroyed her by striking her with an Aura empowered punch which saved his friends, and even Diabolico.

Despite the destruction of her body, Bansheera's spirit survived and she turned Diabolico into a puppet for Olympius at his request.

After Jacob and Smaug defeated Olympius, Bansheera revived both Diabolico and Olympius as Super Demons with new powered-up bodies that were now stripped of their souls and took possession of them in an attempt to fulfill her goal of destruction. She was finally destroyed in the end after she was stripped of all her power when the Legendary Pokémon Zygarde, empowered by Ash's aura and Serena's psychic powers, defeated the Super Demon Diabolico and Olympius with an aura/psychic empowered Core Enforcers, and as a result her spirit retreated to Earth's upper atmosphere before blowing up from her exposure to aura and psychic energy.

Character
Queen Bansheera can be best described as ruthless, cruel, and insane. Nothing short of being obsessive, while she is shown to be quite calm and patient, Bansheera would go to any lengths of returning to power and became notorious for sacrificing her minions to achieve her agenda.

She also considers herself above using Pokémon of her own.

Powers and abilities
Among her powers include teleportation, causing a tidal wave, telekinesis, hypnosis, to name a few.