
Nakaoka is credited on Pokémon Trading Card Game illustrations from 2003 to 2007. The work spans the EX and Diamond & Pearl series, with frequent appearances in Diamond & Pearl, Unseen Forces, and Team Rocket Returns. Across these releases, Nakaoka also contributes Trainer cards, extending the credit line beyond Pokémon subjects.
The visual approach is often cartoonish and playful, pairing simple, balanced layouts with moments of dynamic action. Color is typically vibrant and contrasting, supporting clear silhouettes and central, character-forward staging; moods range from lighthearted to mysterious. Empoleon (Diamond & Pearl) is a representative card in this dataset. Among the most sought-after cards illustrated by Nakaoka is Articuno ex.