If you manage to acquire an egg from a mission, chapter or the daycare, it will take five days to hatch. Place eggs in your inventory until you've hatched them!
It's as simple as that~
Of course, makin' eggs isn't reserved to the wild pokemon! If you have two romantically involved pokemon, they can have an egg at any time. In order to start a "session" you will first need a Sweet Sweet Incense worth 3000 PD. You need one Sweet Sweet incense for every egg you want, unless two roleplayers are involved; then one incense covers one egg for each player. Only Rank Two pokemon may participate in such activities, and at least one partner must be second stage (provided neither partner is single-stage only.)
Simple as that~
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Now making eggs is a little different, only Rank 2 Pokemon may make eggs and only if one of them is evolved.
[No baby Pokemon can make an egg.]
You make eggs anywhere you please, granted you ha.
