Flying(Type)

The Flying Type is one of the seventeen types. Lairy, the Leader of the third Gym, specializes in Flying Type Pokemon. Flying type is immune to Ground(Type)

Trivia
Until Generation V onward, there are no Pokemon in known existence that are pure flying-type.

As of Generation V, there are  84  Flying-type Pokémon or 12.94% of all Pokémon, making it the third most common type, behind Water  (16.80%) and Normal  (14.95%)

Battling Properties: Whom to Choose as The Best Decision
Battle experts recommand the usage of Electric Types, Ice Types, and Rock Types; Flying Pokemon bear immunity to ground type-moves, and are also resistant to a Fighting Pokemon's psychical blows.