Pokémon Gold and Silver/Mt. Mortar — StrategyWiki

Although you can access Mt. Mortar earlier in the game, you won't have Waterfall the first time you pass by. To conquer the inside of the mountain properly, you
Although you can access Mt. Mortar earlier in the game, you won't have Waterfall the first time you pass by. To conquer the inside of the mountain properly, you

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