Pokémon Emerald walkthrough/Rustboro City

Rustboro City
Now you're ready to head into the gym.
 * 1) Heal at the Pokémon Center, and then stock up at the Pokémon Center; buy plenty of Super Potions, as the next city you visit will not have a Poké Mart.
 * 2) Go into the first building to your left, where a boy on the second floor will give you a Premier Ball.
 * 3) Go into the house west of the Pokémon Center, where a guy will give HM01 (Cut). A HM, or a hidden machine, is a move that can be used outside of battle for removing obstacles. Don't put them on good Pokémon like your starter; use a spare Pokémon you don't intend to use for the sole purpose of making it learn HMs. Currently, though, you cannot use Cut outside of battle. You need the gym badge from this town first.
 * 4) Slightly northeast of the Pokémon Center is the Trainers' School, where you can read about Status ailments on the blackboard. If you talk to the teacher, you will receive the Quick Claw which occasionally allows a Pokémon to attack first during a turn in battle. Also, you can find Scott (the black sunglasses dude) inside the building around the lower-left corner, who tells you that he is searching for talented Trainers.