"These Pokémon prefer a tidy habitat. They are always sweeping and dusting, using their tails as brooms. Each has the ability to fool a large group of people simultaneously. They protect their lair with illusory scenery."
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This Pokémon evolved from a Zorua.
Zoroark is a Dark-type Pokémon owned by Lexi. He was first introduced in The Alexis Saga series, appearing as a Zorua in BW001, reappearing and evolving in BW062 before being caught in the same episode.
Zorua was one of the featured Pokémon in the main series Zoroark: Master of Evolution movie, which Lexi had a supporting role in. It was given to Lexi at the end of the film to bring back to Unova setting up her journey to Unova.
The Alexis Saga
Zorua appeared in the first three episodes of Best Wishes before it was given back to a middle-aged Trainer, to Lexi's upset. However, it returned in BW062 after it was revealed to have been captured by Team Plasma. In BW062, it evolved into Zoroark, in which it was then saved by Lexi, joining her team afterwards.
From the get-go, Zoroark was seen as the strongest Pokémon on Lexi's team, which is why it was used in all of the final four Gym Battles Lexi had against Clay, Skyla, Brycen and Iris. It continued to provide it's strength when Lexi took part in the Unova League, being used against Grimsley and Caitlin.
Zoroark had several small appearances when Lexi returned to Unova two years later, however, she decided not to use it in her battles as she wanted to train other Pokémon.
Zoroark is extremely protective of Lexi and her Pokémon, and is very loyal towards her too. Despite it's seemingly hard and intimidating nature, he's quite mischievous, often mocking other Pokémon through the use of his illusion ability. Zoroark has also shown to be quite deceiving with his feelings, not wanting to show any emotion whilst in the company of strangers.
Skills
Zoroark has the ability to transform into different living lifeforms or cast illusionary visions. He can fool a large group of people simultaneously, and will protect his pack with illusory scenery.