From Bulbapedia, the community-driven Pokémon encyclopedia.

A Dragon Tamer (Japanese: ドラゴンつかい Dragon Tamer) is a type of Pokémon trainer that first debuted in the Generation III games. They are young men in elaborate purple outfits and capes.

They specialize in Dragon-type Pokémon.

The goal of most of these Dragon Tamers is to attain the status of their greatest member, Lance.

Appearance

Dragon Tamer Sprites

Image from Pokémon Ruby and Sapphire

Image from Pokémon Diamond and Pearl

Generation III-introduced trainer classes
Ruby, Sapphire and Emerald
Aqua Admin | Aqua Leader | Arena Tycoon | Aroma Lady | Battle Girl | Bug Maniac | Collector | Dome Ace | Dragon Tamer Expert | Factory Head | Hex Maniac | Interviewer | Kindler | Lady | Magma Admin | Magma Leader | Ninja Boy | Old Couple | Palace Maven | Parasol Lady | Pike Queen | Pokémon Ranger | Pokémon Breeder Female Psychic | Pyramid King | Rich Boy | Ruin Maniac | Salon Maiden | Female School Kid | Sis and Bro | Team Aqua Grunt | Team Magma Grunt | Triathlete | Tuber | Winstrate | Young Couple
FireRed and LeafGreen
Cool Couple | Crush Girl | Crush Kin | Painter | Team Rocket Grunt
Colosseum and XD
Area Leader | Athlete | Bandana Guy | Bodybuilder | Casual Dude | Casual Guy | Chaser | Cipher | Cipher Admin | Cipher Cmdr Cipher Head | Cipher Peon | Cipher R&D | Curmudgeon | Deep King | Fun Old Lady | Fun Old Man | Glasses Man | Grand Master | Guy Hunter | Kaminko Aide | Lady in Suit | Matron | Miror B.Peon | Mt.BtlMaster | Myth Trainer | Navigator | Newscaster | Pregymleader Rider | Robo Groudon | Rogue | Roller Boy | Shady Guy | Sim Trainer | Spy | St.Performer | Supertrainer | Team Snagem Snagem Head | Thug | VR Trainer | Wanderer | Worker