Mainly, you just walk around until it hatches. But if you have a Pokemon with Flame Body or Magma Armor, put that Pokemon on your team with the egg. It speeds up the hatching time.
There is absolutely no way to hatch it.
put it in day care with another normal type and hatch an egg(evee has to be female)
There is no way of hatching an Arceus Egg. In fact, there is no way of getting an Arceus Egg in-game. The only way that you might be able to is if you have an Action Replay DSi. There may be a few codes over the internet that give you an Arceus Egg. To hatch an egg in the game, you must add it to your party and continue battling. Battling trainers and wild Pokemon help.
you need to clear Pokemon ranger and trade the manaphy egg to diamond/pearl and then you can trade it to platinum but i don't think there is any other way to get manaphy except action replay but if you do that get a magmar or macargo to hatch the manaphy egg faster
The only way I know of is to reset your game. It may be possible to use a "Forced Egg Hatch" code on it though... I've never tried, as I never had reason to.
A faster way to get an egg to hatch is to ride your bike.
There isn't a way to make it hatch fast, but the best way is to put the egg first in your party. It doesn't walk with you, the Pokemon who you put 2nd in the party will but it's a pretty fast way to hatch an egg though.
The only way to hatch a vaporeon is to hatch an eevee and the evole it with a water stone. there is no such this as a vaporeon egg
If u want 2 hatch an egg, i suggest the best way iz to put it in ur party and battle a lot.
no
yes, there is no way a unfertilized egg can hatch
The best way to hatch an egg in diamond version is to use your bike, because as you know, the egg will get closer to hatching if you walk more, and riding your bike counts as walking.