Digimon King is a title given to someone of extreme skill and power. (under construction)
The title is awarded to those who rank the highest in the D-1 card tournament. Makino Ruki is frequently called the Digimon Queen.
Digimon King is the highest rank a Tamer can achieve.
Shoutmon aspires to be the Digimon King in order to protect his village. It is currently unknown exactly what the title entails.