You can't. It burned down when the volcano erupted.
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there is no Pokemon Mansion in Heartgold.
first floor of the cleadon mansion, there is an old lady that give it you
There is no best Pokemon on Pokemon HeartGold.
They are not in Pokemon HeartGold
There is no mansion in SoulSilver.the Pokemon mansion on cinnebar was destroyed when a volcano wreaked its havoc on the island.