What cheat can you use to get all gym badges in Pokemon emerald?

In Pokemon Emerald, there is no legitimate cheat code or in-game method to obtain all gym badges instantly. The gym badges must be earned by defeating each of the eight Gym Leaders in Hoenn region. Using cheat codes or hacks to obtain all gym badges may result in glitches or errors in the game. It is recommended to play the game as intended to fully experience and enjoy the gameplay.