- Like any other regions, Sinnoh also has a wide array of Gyms that trainers can battle to obtain badges and to be able to qualify for battle and face the Elite Four. The Sinnoh Gym Leaders are Roark, Gardenia, Maylene, Crasher Wake, Fantina, Byron, Candice, and Volkner. As you can see, the gyms in Eterna, Veilstone, and Hearthome were remodeled and enhanced with new features in from Diamond and Pearl to Platinum.
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1st Gym - Oreburgh City
- Gym Leader: Roark
Oreburgh City Gym
- Specialty Type: rock
- How to access: Talk to him inside the Oreburgh Mine.
- Rewards: Coal Badge, TM76, can now use Rock Smash
| Diamond/Pearl | Platinum | ||
| Pokemon | Level | Pokemon | Level |
| Geodude | Lv. 12 | Geodude | Lv. 12 |
| Onix | Lv. 12 | Onix | Lv. 12 |
| Cranidos | Lv. 14 | Cranidos | Lv. 14 |
2nd Gym - Eterna City
- Gym Leader: Gardenia
D/P Eterna City Gym
Eterna City Gym (Platinum: Floral Clock)
- Specialty Type: Grass
- How to access: Meet her outside the Gym.
- Rewards: Forest Badge, TM80, can now use Cut
| Diamond/Pearl | Platinum | ||
| Pokemon | Level | Pokemon | Level |
| Cherubi | Lv. 19 | Turtwig | Lv. 20 |
| Turtwig | Lv. 19 | Cherim | Lv. 20 |
| Roserade | Lv. 22 | Roserade | Lv. 22 |
3rd Gym
For Diamond and Pearl:
D/P Eterna City Gym
Hearthome City Gym (Platinum)
- Veilstone City
- Gym Leader: Maylene
- Specialty Type: Fighting
- Rewards: Cobble Badge, can now use Fly
| Pokemon | Level |
| Meditite | Lv. 27 |
| Machoke | Lv. 27 |
| Lucario | Lv. 30 |
For Platinum:
- Hearthome City
- Gym Leader: Fantina
- Specialty Type: Ghost
- Rewards: Relic Badge, TM65, can now use Defog
| Pokemon | Level |
| Duskull | Lv. 24 |
| Haunter | Lv. 24 |
| Mismagius | Lv. 26 |
4th Gym
For Diamond and Pearl:
Pastoria City Gym
Veilston City Gym (Platinum)
- Pastoria City
- Gym Leader: Crasher Wake
- Specialty Type: Water
- Rewards: Fen Badge, can now use Defog
| Pokemon | Level |
| Gyarados | Lv. 27 |
| Quagsire | Lv. 27 |
| Floatzel | Lv. 30 |
For Platinum:
- Veilston City
- Gym Leader: Maylene
- Specialty Type: Fighting
- Rewards: Cobble Badge, can now use Fly
| Pokemon | Level |
| Meditite | Lv. 28 |
| Machoke | Lv. 29 |
| Lucario | Lv. 32 |