post #1551498 post #2520265

A Pokémon Egg is an object from which most Pokémon are known to hatch. Pokémon Eggs have appeared in all core series games where Pokémon breeding has been available. They have also appeared in several spin-off games.

In the core series, with a few exceptions, the eggs usually have a white shell with green spots. In other appearances, an Egg's shell has a variety of coloring and patterns, generally to reflect the appearance of the Pokémon inside.

Sources:
https://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon_Egg#Appearance