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If being strict with availabilities:
Haunter (Built around status moves to get around lower stats
Marowak (Found it pokemon tower and skulls are spooky)
Ninetales (Has mystical connections, found near graveyards in some games)
Kabutops (Has scythes, ancient)
Gengar (Strongest ghost in Gen 1, obvious ace)
If things are a bit more loose, I'd swap Marowak with the Alola form and include Mismagius over Kabutops
