Sorry, messed up.
You can find it at Tin Tower, in the Pokewalker (Dim Cave and Scary Cave course.), Safari Zone (Forest, Night)
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you find gastly in the Burned Tower and the Sprout Tower
Evolve a gastly that you can catch in the sprout tower
To get Gastly you have to go to sprout tower at night.
at night in sprout tower or in route east of Violet city.
you need strong Pokemon or find i a gastly in the sprout tower and lvel that up to about fifteen because then none of her moves will work on u so it is easy to beat her