Preparations

• 1). Collect the Silver Wing from the Radio Director at Goldenrod's Radio Tower.
  
  
• 2). Go to a Pokemon Center and add Pokemon that know Surf, Whirlpool and Flash to your party.
  
  
• 3). Go to a PokeMart and stock up on Ultra Balls.
  
  
• 4). Fly to Olivine City. From the city's coast, use Surf until you find the Whirl Islands.
  
  

Navigating the Whirl Islands

• 1). Use Whirlpool to reach the northeastern island. Enter the cave.
  
  
• 2). Use Flash to light up the cave. Travel to the ladder on the northeast side of the room. Climb down the ladder.
  
  
• 3). Go southwest until you reach the next ladder.
  
  
• 4). Use Surf and fall down the waterfall. Lugia is in a room at the bottom.
  
  

Catching Lugia

• 1). Use Electric, Dark, or Rock-type attacks to weaken Lugia. Try to get its health as low as possible without knocking it out.
  
  
• 2). Use an attack such as Sing or Sleep Power to put Lugia to sleep.
  
  
• 3). Throw Ultra Balls at Lugia until you capture it.