If you're not familiar with what this is, the Nursery simply allows Pokemon to breed, but unlike the Day Care, which was seen in many of the older entries in the series, it does not raise their overall level.
Since Pokemon Brilliant Diamond and Shining Pearl seems to feature this Nursery, fans have inferred that this likely means that the Day Care will once again be gone entirely.Still, if the item does end up making an appearance in Pokemon Brilliant Diamond and Shining Pearl, it would make leveling up the Pokemon that you can find in Sinnoh easier than it ever has been before. .
How do you feel about seeing this element introduced in Pokemon Brilliant Diamond and Shining Pearl