The Day Care Center has been a staple of Pokémon ever since the originals and once again it returns in these games. Located in Route 5, the Day Care Center will take just 1 of your Pokémon and will raise them. The Pokémon will raise by 1 experience point for each step you take and then you'll need to pay 100P plus 100 for each level the Pokémon raises to get it back.
While this is a nice and quick way to raise a Pokémon while raising others in your team, there are more perks to leaving your Pokémon. Now, you will get berries depending on how long you have left a Pokémon there. The longer the time, the better the chance of getting a Golden Berry or even a Rare Candy.