- Rare Candies: Go to the Pokemon League counter in the Hearthome City Pokemon Center. There, trade any Pokemon holding a Pearl and a Big Pearl for a Rare Candy. You can repeat this process as many times as you want to get as many Rare Candies as you need.
- Master Balls: Go to the Safari Zone gate and talk to the person to the left. He will give you ten Safari Balls. Save your game, then throw all ten Safari Balls into the water. Reset the game, and you will have ten more Safari Balls. Keep repeating this process until you have as many Safari Balls as you want. Then, go to Route 210 and find the house with a red roof. Talk to the man inside, and he will give you a Master Ball in exchange for 500 Safari Balls.
- Shiny Pokemon: To increase your chances of finding a shiny Pokemon, go to the Trophy Garden in Eterna City. In the middle of the garden, there is a fountain. If you stand in front of the fountain, you will see a statue of Palkia or Dialga, depending on which version of the game you are playing. If you examine the statue, it will tell you your current shiny charm status. The shiny charm increases the chances of finding a shiny Pokemon. You can increase the effectiveness of the shiny charm by defeating trainers in the Battle Tower.
- Money: To get a lot of money quickly, go to the Pokemon Center in Jubilife City. Talk to the man sitting at the counter, and he will give you a Vs. Seeker. Go to Route 201 and find a trainer who has a Pokemon at a low level. Defeat the trainer, and you will get a lot of money. Repeat this process as many times as you need to earn enough money.