You can use a dark type move
Lopuny is a normal type.Use rock,ghost,or steel Pokemon to defeat the Pokemon.
Get the silph scope at silph co in Saffron city. Then you'll be able to fight the ghosts.
You have to attain the Silph Scope to reveal the ghost. Kill it (LVL 30 Marowak) and then fight a series of Rocket grunts to get to Fuji, who gives you a pokeflute.
Dark type and itself Don't use bug And fight or normal won't even affect
Go into her Gym and make it through the maze. She battles with Ghost Pokemon, watch out for the Mismagius.
Ghost pokemon are good against psychc and ghost.
I think shes in harthome city, but not sure. but in fire red version, theres a ghost marowak in the tower where you fight your rival.
It is a Ghost/Dragon pokemon.
spiritomb (ghost,dark) lucario (fight,steel) garchomp (drag,ground roserade grass,poison milotic (water)
You get the flute by saving the old man in the Lavender tower. This requires you to first get the Silph Scope from the Game Corner to see and fight the ghost pokemon.
Ghost or dark pokemon
Because Ghost Pokemon can't see in the dark.