You can´t,you must catch a pokemon that has it or train it until it learns the move,like for example,Illumise,You can catch one that knows sweet scent at Lv.13 at route 117.Another example is an Oddish,which you can catch one just about everywhere on land.
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all you have to do is find TM 12 that contanis sweet scent
Just get an oddish or or skiploom etc. they learn sweet scent at around lv 20.
You can't you have to catch a Pokemon that either knows sweet scent or train it to the point when it does some examples of these are Illumise. You can catch one that knows sweet scent at Lv. 13 at Route 117. Another is Oddish. You can catch one just about everywhere on land, or yopu can waste 500 currency units to catch one in the safari zone. Your choice.
TROPIUS should until you delete SWEET SCENT or roselia's SWEET SCENT TOO.
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.