All Working Harry Potter and the Prisoner of Azkaban Cheats - GBA

Secret chests
Complete your collection of wizard cards to unlock the five secret chests on floor five. The first chest contains the Tea Leaf mini-game, which is playable from the main menu. The second chest gives you four or five good cloaks. The third chest gives you a Golden Snitch and levels up your party by one. The fourth chest gives you Spellotape A Charm for Hermione. The last chest levels up everyone in your party by two levels. The rewards can be used again each time you start the game over.

Harry Potter Wizard card
Successfully complete the game to get the Harry Potter Wizard card. Use the card in battle to teach everyone in your party all possible spells and spell levels.

Wizard Cracker Pop-It mini-game
After about three quarters of the way through the game, you will attend a dinner. You will play this game at this point. After you play it, the game will be unlocked on your mini-game menu.

Ridikulus Boggart Challenge mini-game
At some point you will attend Professor Lupin's Defense Against The Dark Arts class. You will face against a spider, Snape, a snake, and a mouse. After this, the mini-game will be unlocked.

Defeating the Professor Lupin (werewolf)
After you rescue Buckbeak, you must fight Professor Lupin when he turns into a werewolf. First, use Fumos with Hermione if she goes first. Fumos will cover Buckbeak and raise his ability to dodge attacks. To ensure that Hermione goes first, you should either equip her with the best items to make her agility the highest, or just make sure she is the highest level person and the only one with items equipped. Lupin only attacks Buckbeak. This battle is rigged so that Buckbeak always goes first, then Lupin, then yourself. Buckbeak will attack Lupin every turn, doing about 20 to 25 damage. Lupin has about 600 HP. None of your spells affect him -- this battle will rely on Buckbeak. If he dies you will lose. The only thing you can really do is use Fumos to protect Buckbeak and keep using potions on him when he gets hurt. You can also use the card combo Cracker Jinx. It does about 40 damage to Lupin.

Easy experience
To gain a group of levels at once, you must be at Hogwarts. Go up to the seventh floor. Make sure you have about 1,000 Sickles. Buy as many Cards (Chocolate Frogs) as possible. Check your Folio Universita. Go to the card combo called "Extra Exp". If you have nine of each of the cards needed for that combo (except for the far left one, which is a rare) proceed to a battle with a few very easy enemies, or possibly a Boss. You will want to have all three people with you. Use Harry to use your card combo, Hermione to use Fumos Duo or Uno, and Ron to heal. Once you cannot use the card combo anymore, defeat the Boss or enemy.