Where can you find TM 02 Dragon Claw in Pokemon HeartGold?

Answer 1

Route 27,

You will need: Fly (to get to New Bark town, nothing else), Surf, Waterfall, Whirlpool and approximately 3-5 Max Repels (if you can't be arsed with wild pokémon battles, like me).

Fly to New Bark Town, and Surf on the water to the right of you're house. Use a Max repel

as soon as you get in the water. Keep Surfing Right until you get to land, and then go through Tohjo falls. Surf and then go up the Waterfall. Go down the other one and go straight out the cave. When you exit, surf right and keep going until you get to land. There will be a cooltrainer (i think it is) and a big Patch of grass. Walk left and Surf down when you get to the bridge. Go to the First Whirlpool down below. Go through it and there will be a small space of land. Go behind the trainer if you want to avoid the battle (he has a lvl 40 Farfetch'd) and get the pokéball, inside will be TM 02, Dragon Claw.

Also, you can get it from the Goldenrod City Department Store drawing 1st Prize [sunday]

Hope this helped :)