Question: how to beat the elite four in pokemon emerald?
Answer: Bring many potions (hyper potions) and ethers/elixirs. Helpful 5 Not Helpful 0.
Make sure you range the types of your Pokémon! You could get killed easily! ... 
Catch Rayquaza. He is obtainable before the elite four at the top of sky pillar. ... 
Have all six slots filled in your bag for Pokémon. ... 
Try again if you fail!