Manaphy does not have a fossil, as it is not an ancient Pokemon.
No legendary can lay an egg except for manaphy which gives an egg to phione and you can not get manaphy or phione in heartgold
Manaphy and Blastoise cannot breed. Manaphy can only breed with ditto or another Manaphy.
You can not get an Armor Fossil in HeartGold.
breed a manaphy and a ditto
you need to do a special mission in Pokemon ranger to get a egg transwer ot to a pearl or diamond then trade it to your heartgold You can do that but i got manaphy in a VERY STRANGE WAY! I was looking for unown? and ! with my pokegear then a manaphy popped out of nowhere!!!
You'll need to use the Action Replay to get the Manaphy Egg or the Manaphy itself. The event has already passed for Manaphy.
You cannot get a Skull Fossil (Cranidos) in Pokemon HeartGold.
Manaphy is not found in the wild anywhere in the Pokemon world. You must trade a Manaphy Egg from Pokemon Ranger to get a Manaphy, or use a cheat of some sort (R4(i), Action replay, etc...)
He's not you just have to transfer it from Platinum, diamond, and pearl.
You'll need to use the Action Replay now, because the event for the Manaphy Egg is over.
manaphy can be given to the heartgold game pack by using mystery gift and also completing Pokemon ranger, you should be able to transfer over the manaphy egg, if not then transfer it over to diamond/pearl and trade it to heart gold, you can breed manaphy with a ditto and get an egg which hatches a phionie, phionie does not evolve into manaphy. hope this helped :)
The only way to get a Manaphy is to beat Pokemon Ranger, do the bonus mission where you save a Manaphy egg, then transfer the egg over to Diamond, Pearl, or Platinum, then trade from Diamond, Pearl, or Platinum.