Things You'll Need
Instructions
Go to Route 45 or the Dragon Den. It does not matter which. The levels and probability of encountering Dratini and Dragonair are identical. Stand next to any body of water in this area.
Lower your fishing rod into the water. If you use the Good Rod, you can only find Level 20 Dratini. If you use the Super Rod, you can find Level 40 Dratini or Level 40 Dragonair. Keep fishing until you find a Dratini or Dragonair.
Weaken the health of the Dratini or Dragonair until it is nearly dead.
Throw Poke Balls at it until you successfully capture it.
Fight Pokemon using Dratini until it evolves into Dragonair. Skip this step if you captured a Dragonair. Dratini evolves into Dragonair at Level 30. If you captured a Level 40 Dratini, it evolves into Dragonair as soon as it reaches Level 41.
Fight Pokemon using Dragonair until it evolves into Dragonite. This occurs when Dragonair reaches Level 50.