Well, go to Goldenrod city, if you know where the flower shop is, talk to the women in there and you will have to have got the citys Gym Badge.
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You can find it in Pokemon Platinum, Pokemon Crystal, Pokemon HeartGold, and Pokemon SoulSilver.
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You can only find Skarmory in the Pokemon SoulSilver version.
Cynthia is not the champion in the johto region in Pokemon heartgold,you can't find her in it, but she is the champion in Pokemon pearl,diamond, and platinum versin and that is the sinnoh region.
I think that TM energy ball doesn't exist in heartgold. You can find it in Pokemon diamond and pearl on ds.