Lugia

Lugia is the silver bird Pokémon that lives on the Whirl islands. It is first introduced in the Gold and Silver games and it is also in Crystal. This Pokémon represents the Silver version of the game. When the tower in Ecruteak City it roosted on burnt in a fire, this Pokémon flew off and never returned. It features in Pokémon 2002(Revelation Lugia/ The-power-of-One). It is both Flying and Psychic type and it learns good moves like Aeroblast, Hydro Pump and Recover

This part contains spoilers for the movie Pokemon 2002: The power of one

In the movie Lugia comes from the sea when the three Legendary birds Articuno, Zapdos and Moltres are roused by a bird Pokémon trainer who tries to catch the trio. Lugia then battles the raging Birds and with the help of Ash and Team Rocket, manages to calm them and restore peace to nature.