a man will gine you a scope so that you will be able to see the mysterious ghost that block the entrance.
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To get past the ghost, you need to get the silph scope. Or you could do it the easy way by getting a poke doll to make the ghost flee.
There is no Lavender Town basement. I assume you mean the top of the town. You will need to beat Team Rocket in Celadon to obtain the Silph Scope in order to even be able to defeat anything in the Lavender Pokemon Tower (your Pokemon will be too scared to move otherwise and the ghost cannot be indentified although 90% of the time it's a Gastly). Head up the tower and defeat the Ghost of Marowak, then you can get into the top of the tower.
You go to the ghost tower
go back to lavender town, then go into the ghost tower (forgot what its called). go to the top. You will have to fight a marawok, then go up the stairs when you beat it. youll have to fight a few rockets. When yo beat them all. talk to the man. and then youll get a pokeflute
I'm going to assume that you're asking why you can't see the Pokemon in the Pokemon tower. First of all, you must obtain the Silph Scope to reveal that the Pokemon in the tower are Gastly, Haunter, and Cubone. The Pokemon at the top who keeps turning you away is the ghost of Cubone's mother, Marowak. You can't catch her, so don't waste Pokeballs on her (after all, she is a ghost).