The 2003 Japan National Championships took place on August 30th 2003, and was a Round Robin Tournament. It was played in the E1-ADV3 format.
Masters:
- Tsuguyoshi Yamato – Blaziken/ Rayquaza ex

Seniors:
- Go Miyamoto – Blaziken / Rayquaza ex

- Gardevoir / Slaking

- Blaziken / Rayquaza ex

- Gardevoir / Salamence

Juniors:
- Gardevoir / Ditto

Huge thank you to @K_da10mo for helping source so many of these results
| ← 2002 National Championships | 2004 Battle Roads Summer → |