Pokéarth - Kanto - Indigo Plateau

Pokemon HeartGold and SoulSilver :: Full Walkthrough

Will, Pokémon Wiki

Me and my Ground-types beat the 1st Round of the Elite Four in HeartGold and became Champion candidates (Hardcore Nuzlocke) : r/nuzlocke

Rainbow Energy Reverse Pokemon League - HeartGold & SoulSilver Pokémon card 104/123

Pokémon SoulSilver [Part 41: The Pokémon League] (No Commentary)

Made It To Kanto in Pokemon Heartgold!

Pokémon Heart Gold & Soul Silver - New Areas

Heart Gold Kingslocke: Episode 15 – Pokémaniacal

Karen - Bulbapedia, the community-driven Pokémon encyclopedia

Are there two Elite Fours in Pokemon Heartgold? Why? - Quora