it depends on what egg you're talking about try and be specific. Annything can hatch from Pokemon eggs, the only legendaies you can breed are manaphy and phoine.
You walk, run or Bike with the egg on your team.
Well on Pokemon black and white there is a mystery egg event.
you will get larvesta, a bug/fire type pokemon.
The Pokemon hatched is LARVESTA, the bug/fire Pokemon.
Train with the Lucky Egg (1.5x EXP) or Trade to another game with the Lucky Egg.
an pokemon egg
You canot a dialga egg in pokemon black and white.
Scraggy
No.
You walk, run or Bike with the egg on your team.
A Rotom will come out, of course!
Well on Pokemon black and white there is a mystery egg event.
Legendary Pokemon cannot be breed.
No one knows. Because no one saw it
you will get larvesta, a bug/fire type pokemon.
The Pokemon hatched is LARVESTA, the bug/fire Pokemon.
Train with the Lucky Egg (1.5x EXP) or Trade to another game with the Lucky Egg.