How do you get an egg in Pokemon Pokemon FireRed?

Answer 1

Go to four island and go into the daycare put two Pokemon of opposite genders or a ditto and any other Pokemon walk around for awhile come back to four island and talk to the old man he will give you an egg.

Answer 2

You stick a boy ditto and another Pokemon that's a girl or you stick a girl ditto and another Pokemon that's a boy in the day care