From Bulbapedia, the community-driven Pokémon encyclopedia.

Galactic Boss (Japanese: ギンガだんボス Team Galactic Boss) is a type of Pokémon trainer that first debuted in the Generation IV games. It specifically refers to Cyrus, the boss of Team Galactic.

Appearance

Cyrus' Sprite

Image from Pokémon Diamond and Pearl

Generation IV-introduced trainer classes
Diamond and Pearl
Artist | Belle & Pa | Cameraman | Clown | Commander | Cowgirl | Cyclist | Double Team | Galactic Grunt Galactic Boss | Idol | Jogger | Poké Kid | Rancher | Reporter | Socialite | Tower Tycoon | Veteran | Waiter Waitress | Worker
Battle Revolution
Bug-Catching Man | Challenger | Close Siblings | Colosseum Leader | Colosseum Master | Cool Beauty Cute Maniac | Electrifying Guy | Future Girl | Girl In Love | Hardheaded Girl | High-Tech Maniac Hiking Club Member | Hiking Girl | Icy Guy | Joe Groupie | Leader-in-Training | Little Queen | Lone Wolf Mature Couple | May-December Couple | Muddy Boy | Ordinary Guy | Ordinary Lady | Passionate Man Passionate Rider | Picnic Girl | Pikachu Fan | Poison Tongue Boy | Pokétopia Master | Sashay Fan Club Sci-Fi Maniac | Shocking Girl | Sightseer | Steel Spirit | Stubborn Boy | Swimming Champ | Swimming Club Member Three Brothers | Three Sisters | Tomboy | Traveling Guy | Traveling Lady | Twin Brothers | Twin Sisters | Youthful Couple