The Rock and Steel types resist them because a normal person's hit against those elements is not very effective, as they are both hard. They're immune to the Ghost type and vice versa because a mortal and a ghost can't hurt each other.TriviaThe...
Many of the Normal moves (besides Odor Sleuth and Foresight) had no effect against the Ghost-type Pokemon. However, in Pokemon Go, instead of total immunity from your attacks, you get 0.39x damage from Ghost. In other words, you get around 60% damage from Ghost-type moves. Above all, ...
Pokemon Brilliant Diamond and Shining Pearl Normal Pokemon Tier List, ranking the weakest and strongest Normal-Types in Pokemon BD/SP.