unofrtunately, you can't unlock the hoenn or sinnoh regions in heartgold or soulsilver. but i hear that the Pokemon executives are going to come out with a game that encompasses all the regions soon. (I think it starts with the hoenn region, then goes to kanto, then johto, then sinnoh.
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By earning Watts, and events. You can get these by basically walking lots, so the more you walk, the more courses you get. You get 1 Watt every time you walk 20 steps.
I don't think there is any way to get to the Hoenn region in HeartGold and SoulSilver except for glitching your game.
pokewalker. i think it is in big forest bit you need 40000 wats to unlock it
darkrai is not in hg or ss,but in fullmoon lsland in Pokemon plantium but requries an item to unlock it.
Well if you put a Pokemon on the poke walker..and i know this isn't much help. buuut if you unlock the hoenn field (for pokewalker course, and i don't know how to unlock it) keep walking and get over 7500 steps and poke radar and you have a probability of 55% of getting skitty in battle ^^ hope that helped.I think you could at a route on pokewalker.
check on serrebii.net
You cannot "catch" Charmander. When you unlock the Kanto region in Pokemon HeartGold, you have to go to Pallet Town and go into Professor Oak's Lab. He will then give you the opportunity to choose the 3 Kanto starters.