The official Japanese Pokémon website has announced two guide books for the upcoming Let's Go! games. Pocket Monsters Let's Go! Pikachu Let's Go! Eievui Fastest Clear Adventure Guide will be released on the games launch day, November 16th, 2018 in Japan while Pocket Monsters Let's Go! Pikachu Let's Go! Eievui Complete Official Guidebook will be released on December 1st, 2018. The Fastest Clear Adventure Guide also includes a poster, stickers and a capture manga!


Title: Pocket Monsters Let's Go! Pikachu Let's Go! Eievui Fastest Clear Adventure Guide (ポケットモンスター Let's Go! ピカチュウ・Let's Go! イーブイ　最速クリア冒険ガイド)
Publisher: Shogakukan
Release date: November 16th, 2018
Price: 800 yen (tax excluded)

Title: Pocket Monsters Let's Go! Pikachu Let's Go! Eievui Complete Official Guidebook (ポケットモンスターLet's Go！ピカチュウ・行きましょう！イーブイ「完全版」公式ガイドブック)
Publisher: Overlap
Release date: December 1st, 2018
Author: Shinsuke Motomiya & One-Up (元宮秀介＆ワンナップ)
Price: 1,200 yen (excluding tax)

Source: https://www.pokemon.co.jp/info/2018/09/180907_gd01.html