Pokémon Emerald Tips

Gym Weaknesses
Each Gym Leader has a particular weakness, in regards to elemental Pokemon. So if you want to stand a stronger chance of defeating them, be sure to include Pokemon that have moves related to particular elements:

Roxanne: Grass, Water.
Brawly: Flying, Psychic.
Wattson: Ground, Fighting.
Flannery: Water, Rock, Ground.
Norman: Fighting.
Winona: Thunder.
Tate And Liza: Water, Dark, Ground.
Juan: Thunder.