you can't; the only way to get a gabite is to catch a gible in the safari zone, but that takes 100 days to arrive there. you can trade on the GTS or from other people as well to get one.
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Garchomp is obtained by evolving Gabite. Gabite evolves into Garchomp at level 48. To get a Gabite, you must first have a Gible. Gible evolves into Gabite at level 30.
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.