Iris and Eevee VA: Yūki Aoi .

Yūki Aoi is the voice actress for Iris in the Japanese localization of the Pokémon anime, as well as the voice of Eevee in Let's Go Pikachu & Let's Go Eevee.

In her Super Secret Base, her battle team consists of a Mega Altaria, Luxray & Flareon.
As this is a special Super Secret Base, it can be found in the locked back room of the house south to Mossdeep's Pokémon Center.

This QR code was made available at the Jump Festa 2015 in Japan. Thanks @BlackShark for helping the site archive this.