Pokémon Ruby Tips

Get a masterball
In team aqua/magma's hidout is the easiest place to get the masterball. step into the room with the teleport pads then find the right one that will leave you to the office. You'll see four balls so get the ones to the left because the right ones are electrodes. You shoud get a gold nugget and a masterball. Rember you won't get it later in the game.