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Pokemon Diamond and Pearl: Gym Leaders
Sinnoh Gym Leader #1: Roark

Specialty: Rock

Geodude
Lv. 12

Onix
Lv. 12

Cranidos
Lv. 14
Roark Rewards:
-Coal Badge
-TM 76 (Stealth Rock)
-You can use HM 06 (Rock Smash) in the overworld.

Sinnoh Gym Leader #2: Gardenia

Specialty: Grass

Cherubi
Lv. 19

Turtwig
Lv. 19

Roserade
Lv. 22
Gardenia Rewards:
-Forest Badge
-TM 80 (Rock Slide)
-You can use HM 01 (Cut) in the overworld.

Sinnoh Gym Leader #3: Maylene

Specialty: Fighting

Meditite
Lv. 27

Machoke
Lv. 27

Lucario
Lv. 30
Maylene Rewards:
-Cobble Badge
-TM 60 (Drain Punch)
-You can use HM 02 (Fly) in the overworld.

Sinnoh Gym Leader #4: Crasher Wake

Specialty: Water

Gyarados
Lv. 27

Quagsire
Lv. 27

Floatzel
Lv. 30
Crasher Wake Rewards:
-Fen Badge
-TM 55 (Brine)
-You can use HM 05 (Defog) in the overworld.

Sinnoh Gym Leader #5: Fantina

Specialty: Ghost

Drifblim
Lv. 32

Gengar
Lv. 34

Mismagius
Lv. 36
Fantina Rewards:
-Relic Badge
-TM 65 (Shadow Claw)
-You can use HM 03 (Surf) in the overworld.

Sinnoh Gym Leader #6: Byron

Specialty: Steel

Bronzor
Lv. 36

Steelix
Lv. 36

Bastiodon
Lv. 39
Byron Rewards:
-Mine Badge
-TM 91 (Flash Cannon)
-You can use HM 04 (Strength) in the overworld.

Sinnoh Gym Leader #7: Candice

Specialty: Ice

Snover
Lv. 38

Sneasel
Lv. 38

Medicham
Lv. 40

Abomasnow
Lv. 42
Candice Rewards:
-Icicle Badge
-TM 72 (Avalanche)
-You can use HM 08 (Rock Climb) in the overworld.

Sinnoh Gym Leader #8: Volkner

Specialty: Electric

Raichu
Lv. 46

Ambipom
Lv. 47

Octillery
Lv. 48

Luxray
Lv. 49
Volkner Rewards:
-Beacon Badge
-TM 57 (Charge Beam)
-You can use HM 07 (Waterfall) in the overworld.