• English / United States: Mikey
• Japanese / Japan: タイチ
• Japanese (Romanized) / Japan: Taichi
• Japanese (TL) / Japan: Taichi

Mikey is a beginning Eevee Trainer that lives in Stone Town with his three older brothers. For awhile, he wouldn't stand up to his older brothers to tell them what he wanted as they were concerned about evolving any Pokémon that could evolve but Mikey didn't want to evolve his Eevee.

While traveling near Stone Town, Ash Ketchum and his friends noticed Mikey's Eevee tied up to a tree. Initially Brock thought that it might have been abandoned by its trainer but Ash Ketchum wondered why someone would go through all the trouble of leaving food and water for it. They noticed the tag on it and decided to see if they could find its owner.

Arriving at a evolution garden party at Number 14, District 3 in Stone Town, they went looking for Eevee's owner Taichi (タイチ) who's name was on the tag as well in the Japanese original version. They found him and Eevee was ran up to him and was reunited.

Mikey explained to Misty in private that the reason he hid Eevee was because he didn't want his brother's to make him evolve it. He didn't care about it being strong as Eevee is precious friend and likes it just the way it is. She told him he needed to explain the situation to his brothers and be clear about it. She also apologized to him as had Eevee actually been an abandoned Pokémon, she was going to evolve it into Vaporeon.

After his debut battle as an Eevee Trainer against Team Rocket which he won, Mikey showed his brothers that he was strong with his Eevee even without it being evolved. Mikey decided not to evolve this Eevee despite initial pressure from his three brothers but they understood and told him they should have explained to them his decision earlier.