Here's why:
* Type Matchups: Ghost-type moves are super effective against Psychic-type Pokemon and completely ineffective against Normal-type Pokemon. This means a Ghost-type move would have no effect on a Normal-type Pokemon.
* Move Learning: In the Pokemon games, move learning is determined by various factors, including the Pokemon's type, its evolutionary line, and its specific move pool. Normally, Pokemon cannot learn moves that are super effective against their own type. This is a game mechanic that helps to balance the game and prevent certain Pokemon from being too overpowered.
While some Normal-type Pokemon may learn moves that have secondary Ghost-type effects, such as "Shadow Sneak" or "Phantom Force," they are not considered "Ghost-type moves" in the traditional sense.
Therefore, you won't find a Normal-type Pokemon with a move like "Shadow Ball" or "Lick" in their movepool.