Pokémon HeartGold and SoulSilver — StrategyWiki

Pokémon HeartGold​ (ポケットモンスター ハートゴールド, Poketto Monsutā Hātogōrudo?, "Pocket Monsters HeartGold") and Pokémon SoulSilver (ポケットモンスター ソウルシルバー, Poketto Monsutā Sōrushirubā
Pokémon HeartGold​ (ポケットモンスター ハートゴールド, Poketto Monsutā Hātogōrudo?, Pocket Monsters HeartGold) and Pokémon SoulSilver (ポケットモンスター ソウルシルバー, Poketto Monsutā Sōrushirubā

Pokemon HeartGold and SoulSilver :: Full Walkthrough

Pokémon HeartGold and SoulSilver/Violet City — StrategyWiki

Pokemon Heart Gold and Soul Silver Guide - IGN

Pokémon HeartGold and SoulSilver/Olivine Gym — StrategyWiki

Appendix:HeartGold and SoulSilver walkthrough/Section 1 - Bulbapedia, the community-driven Pokémon encyclopedia

Appendix:HeartGold and SoulSilver walkthrough/Section 2 - Bulbapedia, the community-driven Pokémon encyclopedia

Walkthrough:Pokémon HeartGold and SoulSilver, Pokémon Wiki

Pokemon HeartGold & SoulSilver: The Official Pokemon Johto Guide & Johto Pokedex: Official Strategy Guide (Prima Official Game Guide): The Pokemon Company Intl.: 9780307468031: : Books

Appendix:HeartGold and SoulSilver walkthrough/Section 15 - Bulbapedia, the community-driven Pokémon encyclopedia