You will get an Egg Morty when you are completing the side quests. After reaching level 20, the egg with hatch into The One True Morty. At level 5, the egg begins and there are no attacks at all. At this time it is hard to train. You will need to use Level Up Mega Seeds if you want to hatch the eggs. You must need to use them as much possible as you can. But here you must also make sure that you save 1 seed to level the egg up to level 20. As a result it may hatch. After defeating Council Members, you will receive the Mega Seeds by completing some of side quests. By using crafting recipe, you can also craft them later.