No, the language on Pokémon HeartGold cannot be changed to another language if you're playing a different language game except through means that aren't legit.
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no
Pokémon HeartGold isn't out yet. And anyway you can't change language in a Pokémon game.
No. You can't change languages. Even in SoulSilver.
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.