Here's why:
* No Direct Pokemon Placement: The game's code doesn't allow you to directly input Pokemon into specific slots. It uses a random generation system.
* Codebreaker Limitations: While Codebreaker can be used to modify the game in many ways, it's not designed for this specific task.
What you can do:
1. Use a save editor: A save editor is a program that lets you directly modify your save file. You can use one to change the Pokemon in your party to Charmander and Bulbasaur. However, using save editors can be complicated and may void your save file.
2. Trade with friends: The most common way to get Pokemon you want is to trade with other players. You can trade with friends or online to obtain the Pokemon you desire.
3. Breed Pokemon: You can breed Pokemon to get specific eggs that will hatch into the Pokemon you want. Breeding can take some time, but it's a legitimate way to acquire specific Pokemon.
Remember: Using external tools to manipulate your save file can be risky. Always back up your save file before using any save editor or codebreaker.