What is the quickest way to defeat leader Norman in emerald?

To defeat Leader Norman in Pokémon Emerald quickly, use Fighting-type Pokémon, as they are strong against his Normal-type Pokémon. A powerful choice is to level up a Machop or Makuhita, which can learn Fighting moves like Low Kick or Arm Thrust. Additionally, make sure to exploit his Slaking's truant ability by attacking during its turn of inactivity. Using status moves like Sleep or Paralysis can also help to disable his Pokémon temporarily.