I have had a lot of original Japanese works translated into English by a professional. All translations are done by Windii unless otherwise stated.

Takeshi Shudo Translations

Takeshi Shudo was the Pokemon anime's head writer (シリーズ構成, Series Kousei) during the Kanto, Orange Islands and part of the Johto Series. In 2005, AnimeStyle commissioned a weekly column from Shudo about anime screenwriting. He talked at length about the various projects he worked on, including Pokemon. His columns give a rare and candid look into the atmosphere behind-the-scenes of early Pokemon.

Entry 146: What Can I Do For the Anime "Pokemon"?
Entry 147: "Pokemon" Series Constructor That Does Nothing
Entry 151: "Pokemon" with Subtitles
Entry 201: Sorry, I Forgot About Kasumi
Entry 222: Series Construction at My Limits
Entry 223: When I Disappeared From Pokémon

Pokemon Story

Pokemon Story is a book co-written by Kenji Hatakeyama and the Pokemon anime's executive producer, Masakazu Kubo. It contains a wealth of information about the early history of Pokemon, from the games, to the TCG, to the anime. Other segments of the book have been translated by Dogasu's Backpack about the process of localizing Pokemon, and the staff's reaction to the infamous Porygon Incident.

The Origins of Masakazu Kubo and Corocoro Comics
The Mew Giveaway
Pokemon Blue's Conception and Sales

Other Writer Translations

Hideki Sonoda on Pocket Monsters the Movie: The Wishing Star of the Seven Nights – Jirachi
Aya Matsui on Dragon Ball and Being a Woman Scriptwriter