Joshua leads the Pokémon Trading Card Game club at the protagonist’s new school, first connecting by slipping a flyer onto her lunch tray during a solitary meal to quietly offer community. He mentors her in TCG fundamentals but reveals seasoned expertise in their initial duel, overwhelming her with advanced energy-acceleration tactics from his Electric-type deck. His strategy pivots on Jolteon ex’s Evolutionary Thunder, recycled via Super Scoop Up, paired with Dragonite δ’s energy manipulation—a nostalgic EX Series-era build he calls his “old deck.”

After the protagonist bests him in a rematch, he praises her progress, cementing her club membership. He later shares insights on competitive circuits like Regional Championships and key community figures, blending mentorship with friendly rivalry. His signature phrase, “Challenge accepted!,” punctuates both greetings and critical duels, underscoring his lively demeanor.

When the protagonist loses her cards, he selflessly donates his own to rebuild her deck, prioritizing teamwork over personal advantage. Though secondary to the protagonist’s arc, his steadfast presence stabilizes the club’s dynamic. Design and gameplay motifs—crackling lightning, Jolteon’s agility—mirror his role as a spark igniting her competitive evolution.