When The Pokémon Company was first credited as author (著) and as a collaborator (協力) on a Japanese book

What this is

When The Pokémon Company was first credited as author (著) and as a collaborator (協力) on a Japanese book: May 2025, on a Detective Pikachu Lime City guide published by Overlap.

How it’s built

1. Read from the National Diet Library’s catalogue, Japan’s national book register. A second author credit followed in June 2025 on a Pokémon ecology guide from Shogakukan.

What we assumed

Nothing. The figure is used as published.

Sanity check

Earliest found in the catalogue, not proven first; many book records carry no credit text at all.

The values

• 著: May 2025
• 協力: May 2025
• Record id: R100000002-I034093524
• Title: 名探偵ピカチュウライムシティガイド
• Publisher: オーバーラップ

Some detail is too fine to show here; it is kept in the trainer’s notes.

Where it comes from

The line in the source

戸田昭吾, クリーチャーズ, ポケモン 著,ポケモン 監修・協力