No. It's part of the Sinnoh dex.
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You'll need to trade for a Haunter or a Gengar in the GTS or from someone.
You need to get the national pokedex to get national pokedex you need to get all the Pokemon and you need to talk to daun's sister
You trade Haunter to another Diamond, Pearl, or Platinum version and it will evolve into a Gengar. You will need to trade back to your original Diamond game to get the Gengar. Hope I helped, bye
First, you need to catch a Ghastly, which can be found in the sprout tower or caves at night. Evolve it into a Haunter and then trade it. At that it will evolve into Gengar which you need to have it traded back to you.
No because it is a sinnoh Pokemon not a kanto, johto, or hoenn