Tao Trio

The Dragon Trio is the three Legendary Pokémon that appear in that have their own games (Pokemon Diamond & Pearl/Pokemon Platinum), and their own movies (The Rise of Darkrai/Giratina and The Sky Warrior/Arceus and the Jewel of Life) Their names are:

Dialga (Steel/Dragon)

Palkia (Water/Dragon)

Giratina (Ghost/Dragon)

There are some people that think their are "Pokemon Kings". Well there are Dialga and Palkia that were kings #1, then came King #2 (Giratina) and the last king until now is Arceus.