You must have the Silph Scope with you in order to identify them. The Silph Scope can be obtained at the Rocket Hideout (Game Corner in Celadon City) after having defeated Giovanni.
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Lavender town is in Pokemon red, blue, yellow, firered leafgreen. NOT GOLD. also the tower in LAVENDER IS POKEMON TOWER. Defeat it to get pokeflute to get past snorlax
you need to find the silph scope this will reveal the ghost to be a marowak you can then defeat it
Get a Slith Scope and climb the towe. Beware: the ghost Pokemon that you visually see transform cannot be caught with a Pokeball
You need the Silph Scope to see it, then defeat it.
You will need to have the item called the silph scope which reveals the identity of the ghosts that ghost happens to be the deceased mother of a cubone aka Marowak you will have to defeat her in order to reach the top of Pokemon tower.