The Eevee users are a group of nine Trainers around Alola who use Eevee or one of its evolved forms. Each of these Trainers has a unique Trainer class based on the Pokémon they use, such as Eevee User. These Trainers constitute a challenge that the player can undertake after they become the Champion.
At the Thrifty Megamart at Royal Avenue, Kagetora—a man at the leftmost cash register—will initially tell the player to visit him again once they become the strongest Trainer in Alola. When the player speaks to him after becoming the Champion, he will explain that he's looking for a capable Trainer to defeat eight Trainers he was always trying to beat 30 years ago: the other Eevee users. He promises to reward the player if they can manage this feat.
Prior to speaking to Kagetora, the player will not be able to find any of the other Eevee users anywhere. They only appear once the player is tasked with finding them.
Polly used to be a Swimmer called the Wild Whirlpool of Alola. The player can find her on the third floor of the Trainers' School on Route 1, where she works as a cleaning lady with the help of her Vaporeon.
Chad was a magician who used fire, had a quick temper, and loved to fight. The player can find him in the lobby of the Tide Song Hotel in Heahea City, where he always used to stay. He is currently in his retirement, both from work and battling, and would rather relax to a massage, but he is willing to battle the player.
Jane used to be an energetic Lass whose looks belied her tyrannical personality. The player can find her in Malie City Community Center, in the sitting area. She doesn't remember Kagetora, but she remembers Pokémon battles and is willing to battle the player.
Braiden is a man who was rumored to have once died and come back to life, and who Kagetora refers to as "the immortal ruler of the night". He frightened people everywhere. The player can find him at the Hau'oli Cemetery, where he used to hold a ceremony of some sort.
Rea was a cool beauty who was merciless in pursuing her opponents and was known as Miss Absolute Zero. The player can find her in her hometown of Iki Town, in the southwest house. Her sole desire now is to spend as much time as she can with her grandchildren.
Linnea was a beautiful, world-famous model. The player can find her at the north end of Hano Beach, near the Hano Grand Resort where she always stayed between jobs. She is determined to maintain her youthful looks as long as money and medicine can manage. Despite this attitude, she admits that her body still feels its age.
Kira is the granddaughter of the original Sylveon User, Sakura, who was a pure woman who Fairy-type Pokémon adored like a queen. She was a descendant of the seafolk, but, unbeknownst to Kagetora, she passed away a year ago. The player can find Kira, who takes care of Sylveon now, in the Seafolk Village, in the Steelix ship in the east. According to Kira, Sakura also tried to teach her about battling before she passed away.
Kagetora was a young Trainer who always used to challenge the other Eevee users, but never won. Now he has a wife and child, along with other new worries like a mortgage. He initially sets the player on a quest to find and defeat the other eight Eevee users in his stead. After the player accomplishes this feat, he will ask the player for a battle, and if the player wins, he will reward the player with Eevium Z.