Darrius

Darrius (ダリウス, Dariusu), more commonly known as the "Ghost Pokémon Master", is a well-respected resident of Mimosa City in the Hora region.

Character
Darrius demands respect, not for himself, but for the Pokémon around him; specifically the legendary Pokémon, Darkrai, that calls Mimosa City its home. He seems to genuinely care for both Pokémon and young trainers alike, offering those that prove themselves to be friends to Pokémon a chance to train alongside him and his Darkrai.

History
Darrius is the father of Dennis, a current member of Hora's Elite Four; being a former member himself. He watches over the Pokémon Cemetery in the city, at the base of Mt. Hora, and is friends with the who reside there. For those that also prove themselves to the native Darkrai, Darrius will offer training; mainly in the Counter Shield method of fighting.

Trivia

 * His name isn't revealed in the chapter he appeared in.