Zaira

Zaira is a friend of Vergil and Cole, about 10 years older than them. She is 26 at the beginning of the story, and will probably be around 29 by the end.

Zaira is a trainer of fire and psychic pokemon. She wants to spread her ideology as much as possible, and her whole belief system and fighting style revoles around that.

One of her main quests will be to find and capture Victini, which is said to be a pokemon that makes a trainer to never lose. She is hoping that Victini will allow her to perfect herself, making her the ultimate trainer.

Ideology
She believes that each person's power comes from the fire that burns in our spirit. That's why she uses this type combination. She has psychic powers of her own and much of her training involves meditation instead of actual fighting. In the end, she is able to completely come to full synchronization with her pokemon, attacking with dual type attacks (something very unusual) and removing the water weakness from her fire-psychic pokemon, by having psychic energy shield around them, repelling the water.

As a result of mastering her fighting style, she is one of the strongest trainers out there, and will fight in the tournament in the end.

Pokemon
Delphox:

her first pokemon, fire and psychic type. She has a very strong bond with it.

Darmanitan:

Her second pokemon, and probably the strongest. It is always in Zen Mode, while others can keep this form only for a while. This is a result of extensive training, meditating, and state of mind.

Gothitelle:

A pokemon which bonded with Zaira and achieved psychic and emotional peace, therefore removing all the burdens from her. Gothitelle will eventually die, making Zaira question her life choices, but after dealing with grief, she will be even stronger than before.

Espeon:

Usually outside the pokeball, Espeon is a travelling partner to Zaira. Espeon is also a master at sensing nearby danger.

Rapidash:

A unique rapidash, she is fire/psychic type since she is the offspring from a kantonian and a galarian Rapidash, seemingly born galarian, but having combined her fairy and fire types. Professor Oak (Gary) mentioned that this may be the effect of her psychic connection to Zaira. More specifically, he said that while being developed in the egg,Ponyta had a psychic connection to Zaira, and was influenced by that. Therefore, she changed her development to inherit more fire type characteristics. Instead of adapting to forest life, she has created her mane by the spirit fire. She has a unique attack called fairy fire. By dual fighting with any other fire type, she can imbue the other pokemon's fire attacks to be fairy type as well. Rapidash is also the means of transportation for Zaira.

Magby:

After Gothitelle dies, Zaira takes up this egg and hatches it to Magby. She also finds a special item that boosts special attach of unevolved pokemon, making Magby's fire attacks epecially strong, regardless of the fact that it is unevolved. Due to Magby being a baby and pure and innocent as a result, it can be imbued a lot by Rapidash's fairy flames.

Victini:

In the end, Zaira is successful in catching Victini. This proves to be a big asset.

Events
Zaira will meet Cole and Vergil close to the beginning, and will travel with them for a while. She will train a lot with them, help develop their psychic pokemon (like tyrogue), and will also play the role of a psychologist. She will bond with them by helping them deal with the loss of Misty, Ash's abandonment etc. The boys will find some relative peace with her help.

During a fight, her Gothitelle will die. This will shake her as a trainer, and since her whole fighting style revolves around her being in peace with her spirit, she will break down and not be an effective or strong trainer. The boys will take care of her for a bit, but eventually she will deal with her loss and grief, and will take on a new egg to raise. After she accepts the fact that Gothitelle is gone, and that raising a new pokemon doesn't mean that she is replacing gothitelle, she will leave the company of the boys in order to go alone and complete her healing. When the boys see her again, she will be back to her old self, and maybe will have caught victini as well. Or maybe she will catch it with the boys.