From Bulbanews, your community Pokémon newspaper.
To be available May to June
The Eeveelutions will be distributed at Pokémon Centers and Pokémon Stores in Japan for Pokémon Sun and Moon. Vaporeon, Jolteon, Flareon, Espeon, Umbreon, Leafeon, Glaceon, and Sylveon will be available.
The distribution will be held from May 13 to June 23, 2017. Players can only obtain one Pokémon per day from this distribution. No further details about the Pokémon to be distributed have been announced.
This distribution is being held to promote a new line of merchandise that is inspired by Eevee and its evolutions.