There isn't Murkrow's Ghost in Pokemon HeartGold. It maybe just a rumor.
trade
The Ghost-type Pokemon in the HGSS Regional Pokedex are: Gastly, Haunter, Gengar, Misdreavus, and Mismagius. The Dark-type Pokemon are: Umbreon, Murkrow, Honchkrow, Sneasel, Weavile, and Tyranitar.
Have a friend trade a Pokemon that is holding a dusk stone then you can evolve your murkrow
murkrow and another Pokemon
The safari zone (swamp area)You can find Murkrow at:Route 7,Route 16Safari Zone
dusk stone. and it evolves murkrow,too.
in lavender town where the towers at with ghost dbzpokeyu
Yes, in Safari Zone at night. And in Route 16 and 7 also at night.
they are weak against dark type Pokemon such as umbreon, or murkrow with moves such as bite or crunch
Gengar is a ghost-poison type pokemon that evolves from Haunter.
ponie
Get a Dusk Stone and use it on Murkrow.