Get a Slith Scope and climb the towe. Beware: the ghost Pokemon that you visually see transform cannot be caught with a Pokeball
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you need to find the silph scope this will reveal the ghost to be a marowak you can then defeat it
You need the Silph Scope to see it, then defeat it.
When a sim dies from fire their ghost is red.
Haunter.... There isn't that many ghost types in firered besides the Gastly line which you can find in Lavender Town's Pokemon Tower
You need the Silph Scope to find the ghost's identity bet you have to get it from Team Rocket's boss. When you defeat him, he will leave it behind. Get it and go to Pokemon Tower. Then go to the stairs where a ghost won't let you pass. You find out the ghost's identity, which is Marowak. Then defeat it and it will calm down and depart to the afterlife.