Im pretty sure Sweet Scent can longer be taught to a Pokemon VIA TM. That goes for Generation 3+. In order to teach a Pokemon the move Sweet Scent. Since you're playing HeartGold, you need to travel to Azaela Town and Talk to a Girl with a Butterfree beside her behind a Counter. You can find her in one of the Entrances/Exits of the Ilex Forest.
The building that seperates Azaela Town and Ilex Forest. Enter the building and on the right side of the screen you should see a girl with a Butterfree.
Talk to her and she can train a selected Pokemon the move Sweet Scent.
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To get a Shedinja in Pokemon Heart Gold you must trade it from either Pokemon Ruby, Sapphire or Emerald. Jacko25
Of course
you don't get the red orb in Pokemon heart gold you get the blue orb that you use to get kyogre
Geodude evolves after level 35 in heart gold
You can't get the azure flute in Pokemon heart gold you have to trade it from an older game than heart gold. Sorry :(