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

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

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