you can't of course.
You Cant change the language but you can wait until the English version comes out.
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Pokémon HeartGold isn't out yet. And anyway you can't change language in a Pokémon game.
no
No. You can't change languages. Even in SoulSilver.
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.
Yes, you can. Pokemon HeartGold uses the time from your DS settings. So, change the time on the DS and the time in Pokemon HeartGold will change with it.