
Adoption Centers are the new replacements for Pokémarts.

There is no use for the Pokémart in Elite Redux with battle items disabled and Nurse Joy giving you almost everything you could want. So instead, in its place… Welcome to the Adoption Center!
In Adoption Centers you can spend BP gained from trainer battles to buy Redux Pokémon, which are not available any other way, with a few special exceptions, as well as Mega Stones for some new Mega Evolutions once Norman is defeated.
These Adoption Center Pokémon Can also be useful in your Monotype runs or create some fun challenges, like Redux Pokémon only.
You can find the Adoption Center in every town. (Lilycove City has its AC in the Department Store).
At the start of the game:
Beating Roxanne:
Beating Brawly:
Beating Wattson:
Beating Flannery:
Beating Norman:
Talking to Noman before fighting him also unlocks Mega Stones and adds Mega Stones to the Adoption Center.
Beating Winona:
Beating Tate and Liza:
Beating Juan and Wallace:
If you want to know more about these Pokémon, such as their Abilities and Innates, you can check out the ER Online Dex.