The calculator app is only used for basic math calculations, like addition, subtraction, multiplication, and division.
To catch wild Pokemon in Diamond, you'll need to:
* Engage in battle: Encounter a wild Pokemon and initiate a battle.
* Weaken it: Use your Pokemon's attacks to lower the wild Pokemon's HP.
* Throw Poke Balls: Once the wild Pokemon is weak enough, throw Poke Balls to try and catch it. The weaker the Pokemon, the higher your chances of success.
Remember, different Poke Balls have different catch rates. Poke Balls are the most common, Great Balls have a slightly higher catch rate, and Ultra Balls have a much higher catch rate. You can also use items like berries to increase your chances of catching a Pokemon.