In Pokémon HeartGold, Dragonair can primarily be found by fishing in the Dragon's Den, located behind the Blackthorn City gym. Players can also encounter Dragonair in the Safari Zone’s Wetland area, where it appears at a low encounter rate. Additionally, you can evolve a Dratini, which can be caught in the same locations, into Dragonair at level 30.
Level 55
magikarp dratini dragonair
No, you need to evolve a Dragonair.
You must evolve Dragonair, which you get in the Dragon's Den.
Dragon's Den (Blackhorn City)
You level up a Dragonair to Level55 then - hopefully - it will evolve into a Dragonite.
Dragonair are found rarely at Mt. Coronet.
You must evolve Dragonair (available from the Dragon's Den; use super rod) to get it.
in map 4
Mount silver, or the elite four (With exp share.)
First you have to play the casino/games place in goldenrod city (where you battle whitney) and earn game points by playing voltorb. Once you get enough points you can redeem them for a dragonair. Hope it helps. P.S. the games place is not inside the gym.
Dratini evolves into Dragonair at level 30.