Diamond/Pearl Gym Leaders & Elite Four
Following the tried-and-tested Pokémon formula, in Diamond/Pearl you battle your way through 8 gyms, each specialising in a particular type. Following that you take on the Elite Four and the Champion.
Gym #1, Oreburgh City

Roark
Coal Badge
Rock type Pokémon
Gym #2, Eterna City

Gardenia
Forest Badge
Grass type Pokémon
Gym #3, Veilstone City

Maylene
Cobble Badge
Fighting type Pokémon
Gym #4, Pastoria City

Crasher Wake
Fen Badge
Water type Pokémon
Gym #5, Hearthome City

Fantina
Relic Badge
Ghost type Pokémon
Gym #6, Canalave City

Byron
Mine Badge
Steel type Pokémon
Gym #7, Snowpoint City

Candice
Icicle Badge
Ice type Pokémon
Gym #8, Sunyshore City

Volkner
Beacon Badge
Electric type Pokémon
Elite Four #1

Aaron
Bug type Pokémon
Elite Four #2

Bertha
Ground type Pokémon
Elite Four #3

Flint
Fire type Pokémon
Elite Four #4

Lucian
Psychic type Pokémon
Champion

Cynthia
Mixed types