What are all the dark and ghost type Pokemon in HeartGold?

Here's a list of all the Dark and Ghost-type Pokémon you can find in Pokémon HeartGold:

Pure Dark-Type:

* Houndour (Evolves into Houndoom)

* Murkrow

* Sneasel (Evolves into Weavile by trading while holding a Razor Claw)

* Umbreon (Evolves from Eevee by leveling up with high friendship at night)

Pure Ghost-Type:

* Gastly (Evolves into Haunter, then Gengar)

* Misdreavus

* Sableye

Dual-Type (Dark/Ghost):

* Sableye

Important Notes:

* Houndour: Found in the Ilex Forest and occasionally in the Union Cave.

* Murkrow: Found in the Ilex Forest, Sprout Tower, and occasionally in the Union Cave.

* Sneasel: Found in the Ice Path.

* Umbreon: Evolves from Eevee during the night; Eevee is found in various locations throughout Johto.

* Gastly: Can be found at the Sprout Tower.

* Misdreavus: Found in the Sprout Tower, Ecruteak City, and occasionally in the Union Cave.

* Sableye: Can be found in the Union Cave.

Let me know if you have any more questions about Pokémon HeartGold!