Nothing.... you have to take it back to prof. elm and when they relise it is DEFIANTLY a Pokemon egg his assistant will meet you in violet city and give it to you, after 12-24 hours of playing it will hatch into a togepi!
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the mystery egg is a togepi...it hatches after walking with it for awhile
Well on Pokemon black and white there is a mystery egg event.
The Mystery Egg is an egg you're given after beating Falkner at Violet City. It hatches into a Togepi.
sometimes if you finish a mission you can get a egg
No