After the library we move onto Route 8, grabbing our egg along the way, arriving in Miara Town, where we get another encounter. Then we move to Stormy Seas, catch our egg, then get another one in the Whirl Islands. That rounds out the encounters here, which means its time to hatch.
The first one hatches into a Cherubi, whos may be helpful in a few fights.
Next hatches Phanpy, there is a Mega Donphan in this game, so it might be useful.
Then we hatch a Lunatone which probably won't be used.
And finally we hatch a Delta Shinx, which learns Metal Burst, so this will be great.