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The Wonder Egg is an item found at the end of Surrounded Sea along with 3 Deluxe Boxes. It goes into the Treasure Bag until the player leaves the dungeon. The next morning, the Wonder Egg hatches into a Manaphy, and the Wonder Egg cannot be collected again.
If a replay cheat is used to get Manaphy early the Wonder Egg will not hatch no matter how long the player leaves it.