Normal (type)
Normal type Pokemon are just a minor subset of the many species you can use in battle, and their usage in battle is often ignored in favor of other types. Really, Normal type Pokemon are one of the most stable types, because of the fact that they have the fewest weaknesses of any type, and yet they have no advantages either. There aren't much dual type Normal Pokemon, because any Flying type Pokemon that doesn't have an element is part Normal, and the only other one is Girafarig, the Normal/Psychic Pokemon. Weird.
Normal type attacks can be used against most Pokemon, and to get around the immunity that Ghost pokemon have against Normal, you could use a move such as Foresight. Also, Normal types have Hyper Beam:)
Advantages: Normal types have no advantages against any type.
Resistance: Normal types are not resistant against anything.
Weakness: Fighting
Immunity: Ghost