I have herd ghastly is in the sprout tower
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To get Gastly you have to go to sprout tower at night.
you cant u need to catch a ghastly in the sprout tower and evolve it. it is in there at night only.
Ghastly will evolve at level 20.
no you can trade soulsilver pokemon to black
Ghastly evolves into Haunter at level 25, and Haunter evolves into Gengar when traded.