Hold Select + Start + A + B during game play.
Battle Tower Prizes
Complete tasks in the Battle Tower to earn the following prizes:
bullet HP Up
6 or more Victories:
bullet Bright Powder
bullet Choice Band
bullet Focus Band
bullet King's Rock
bullet Mental Herb
bullet Quick Claw
bullet Scope Lens
bullet White Herb
50 Victories in a row:
bullet Award Ribbon
bullet Silver Shield
100 Victories in a row:
bullet Gold Shield
Once you become the Pokemon League Champion, pay extra attention to the TV. It will broadcast information about a super-rare Pokemon. After that, be on the lookout for Latias (Ruby) or Latios (Sapphire).
Watch TV for Hints
Watch television to see commercials advertising bargains and the like. Here are some occurrences to keep your eyes peeled for:
bullet A commercial for the Mauville Game Corner. When it plays, head over there for increased prizes.
bullet A commercial for the Lilycove Department Store. Get a discount after you see the commercial.
bullet Pokemon sighting information. When the TV tells you a specific Pokemon is spotted, go to that location to find the monster in question.
bullet A commercial for the Slateport City energy guy. Go to him to get energy items at a reduced price.
bullet A commercial for the Berry Blender Master.
Berry Blender Master
Tell the Berry Blender Master's Wife certain phrases to get the following berries:
bullet SUPER HUSTLE: You will get a Belue Berry.
bullet COOL LATIOS: You will get a Durin Berry.
bullet CHALLENGE CONTEST: You will get a Pamtre Berry.
bullet GREAT BATTLE: You will get a Spelon Berry.
bullet OVERWHELMING LATIAS: You will get a Watmel Berry.
Changing Glitch Block (Japanese Version)
Go to the fifth city and Surf on the route that has a sign on the water. Next to it is a glitched block. Swim back and forth and it will change.
Battle Without Link Cable
Use a link cable, go into a Pokemon Center, and mix records. Come out and disconnect the link cable. Go to the person's Secret Hideout and they will be there. Talk to them, and you will battle them.
Mix Records in the Pokemon Center
Disconnect the link and go to the Battle Tower and battle. You might see a person that has the same name and Pokemon as your "Mixing Record" buddy.
Get Mystery Event
After you beat the Elite Four, go to Petalburg City and talk to the man by the computer. He'll ask you for a profile. Tell him "Mystery Event Is Excited". After you're done talking to him, save your game and turn your GameBoy off and then back on. You'll now have the Mystery Event option unlocked.
Get More Master Balls
Every time you get 6 matches at the Lottery Corner at the Lilycove Department Store, you will win a free Master Ball.
When you get the Acro Bike, go on it and don't move. Now hold B and you'll start bunny hopping.
You can get "free" time in the Safari Zone by simply not moving from the area where your target Pokemon is. Stand on one square in that zone and lightly tap the D-pad to change the character's facing. Each facing doesn't count towards the step-limit but will count for having an encounter.
Alternately, use the bike to hop-move around. Once you enter the Safari Zone get on the bike and hold B to start hopping. Press the direction you want to go while hopping (to avoid using steps) and you can stay as long as you like.
This cheat will get you some pretty good items early on in the game. All you have to do is catch a Zigzagoon. As you travel around with it, it will have an item attached to it. Keep checking and it will have a new item every so often. This is due to the Pick-up ability.
Upgrade Trainer ID
You can upgrade your trainer ID (from normal to bronze, to copper, to silver, and then to gold) by doing the following things in any order:
bullet Become the Pokemon league champion.
bullet Complete your Pokedex.
bullet Beat 50 trainers in the battle tower.
bullet Receive a ribbon from all five contest types in the master ranking.
Cloning Glitch (Pokemon Emerald)
Head into the Battle Tower and access the PC.
Deposit the Pokemon you want to clone into one of the boxes.
Close the PC and save the game from the menu.
After saving the game, open up the PC and withdraw the Pokemon you deposited.
Head over to the closest counter and enter in the challenge.
This forces the game to be saved, while doing this, turn console off while the game is being saved.
Turn your console on again and look at your new cloned Pokemon, one will be in your party and the other in the position when you deposited it.
If you want, you can even attach and item to your Pokemon and the item will also be coned so for rare TM's like Earthquake, this is very handy. Also, you can clone up to five Pokemon at once, just make sure that you know where you stored them.
Battle in a Friend's Secret Base